chore: Add pre-release issue and PR templates

.github/ISSUE_TEMPLATE/pre-release.md

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+---
+name: Pre-Release Rust Toolchain Update
+about: This template can be used to track the update of the Rust toolchain in this repository as well as all downstream product operators leading up to the next Stackable release
+title: "chore: Update Rust toolchain to 1.XX"
+labels: ['epic']
+assignees: ''
+---
+
+<!--
+    DO NOT REMOVE THIS COMMENT. It is intended for people who might copy/paste from the previous release issue.
+    This was created by an issue template: https://github.com/stackabletech/operator-templating/issues/new/choose.
+-->
+
+## Pre-Release Rust Toolchain Update for Stackable Release XX.(X)X
+
+<!--
+    Replace 'TRACKING_ISSUE' with the applicable release tracking issue number.
+-->
+
+Part of <https://github.com/stackabletech/issues/TRACKING_ISSUE>
+
+> [!NOTE]
+> During a Stackable release we need to ensure that every product operator uses
+> the latest Rust toolchain (used by us). To keep the toolchain in sync across
+> all our operators, we update the version centrally in this repository.
+
+### Update Rust Toolchain
+
+```[tasklist]
+### Tasks in this Repository
+- [ ] Update Rust toolchain in the `config/rust.yaml` file.
+- [ ] Generate downstream PRs using the ["Generate Downstream PRs"](https://github.com/stackabletech/operator-templating/actions/workflows/generate_prs.yml) action.
+- [ ] Merge downstream PRs, see below for more details.
+```
+
+### Merge Downstream PRs
+
+Replace the items in the task lists below with the applicable Pull Requests
+
+<!--
+    The following list was generated by:
+
+    yq '.repositories[].name' config/repositories.yaml \
+    | sort \
+    | xargs -I {} echo "- [ ] https://github.com/stackabletech/{}/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files"
+-->
+
+```[tasklist]
+### Tasks in Downstream Repositories
+- [ ] https://github.com/stackabletech/airflow-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/commons-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/druid-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/edc-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/hbase-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/hdfs-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/hello-world-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/hive-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/kafka-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/listener-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/nifi-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/opa-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/secret-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/spark-k8s-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/superset-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/trino-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+- [ ] https://github.com/stackabletech/zookeeper-operator/pulls?q=sort:updated-desc+is:pr+is:open+Update+templated+files
+
+```

template/.github/PULL_REQUEST_TEMPLATE/pre-release.md

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+## Bump Rust Dependencies for Stackable Release XX.(X)X
+
+<!--
+    Replace 'TRACKING_ISSUE' with the applicable release tracking issue number.
+-->
+
+Part of <https://github.com/stackabletech/issues/TRACKING_ISSUE>
+
+> [!NOTE]
+> During a Stackable release we need to update various Rust dependencies before
+> entering the final release period to ensure we run the latest versions of
+> crates. These bumps also include previously updated and released crates from
+> the `operator-rs` repository.
+
+```[tasklist]
+### Tasks
+- [ ] Bump Rust Dependencies, see below for more details.
+- [ ] Add changelog entry stating which important crates were bumped (including the version).
+```
+
+> [!NOTE]
+> The bumping / updating of Rust dependencies is done in multiple steps:
+>
+> 1. Update the minimum Version in the root `Cargo.toml` manifest.
+> 2. Run the `cargo update` command, which also updates the `Cargo.lock` file.
+> 3. Lastly, run `make regenerate-nix` to update the `Cargo.nix` file.
+
+```[tasklist]
+### Bump Rust Dependencies
+- [ ] Bump `stackable-operator` and friends.
+- [ ] Bump `product-version`.
+- [ ] Bump all other dependencies.
+```