fix(l1,l2): make l2 integration tests and lint required

[gianbelinche]

Motivation
The L2 CI is not running on some PRs it should.

Description
The problem is that the required checks Integration Test and Lint have the same name for both L1 and L2. So if one of them passes, then the other is not needed to merge. This can be a problem in the case that the L1 CI finishes before the L2 one starts, in that case the L2 CI will not run.

The solution is the following:

• Add Integration Test L2 and Lint L2 to the branch protection rules
• Rename the corresponding jobs on the L2 workflow.

With only those changes, we will always require the L2 workflows to run in order to merge, since we want to be able only run the L1 CI in PRs that don't touch the L2, we need a way to skip it.

Note: The current way of not running a workflow doesn't work, since skipping a complete workflow with paths: makes the jobs abscent, what we need is for the jobs to be marked as skipped.

To do this, dorny/paths-filter@v3 action is used, which performs the same action as the paths: option, but as a job itself.
Then with the result of this job we can add ifs to the rest of the jobs to mark if they should be run.

Examples with a fork of ethrex with the branch protection already active (For Integration Test L2)

• PR with changes only in L1: It ran L1 checks and skipped L2 ones.
• PR with changes only in L2: It ran L2 checks and skipped L1 ones.
• PR with both L1 and L2 changes: It ran both L1 and L2 checks.

You can also check that when the PRs were merged to main, all checks ran even though the PRs skipped the checks.
https://github.com/gianbelinche/ethrex/commits/main/

[Copilot]

Pull Request Overview

This PR refactors the GitHub Actions workflows for L1 and L2 to use dynamic path-based filtering instead of static paths and paths-ignore configurations. The changes introduce a detect-changes job that determines whether tests should run based on file changes, improving workflow efficiency by conditionally executing jobs.

• Replaced static paths/paths-ignore filters with a dynamic detect-changes job using dorny/paths-filter@v3
• Added conditional execution to all jobs based on the detect-changes output
• Renamed required checks to "Lint L2" and "Integration Test L2" for the L2 workflow

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/pr-main_l2.yaml	Introduces detect-changes job with path filtering for L2-specific paths; adds conditional execution to all jobs based on detected changes
.github/workflows/pr-main_l1.yaml	Introduces detect-changes job with negated path filter to exclude L2 changes; adds conditional execution to all jobs based on detected changes

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The environment variable should be $GITHUB_EVENT_NAME instead of ${GITHUB_EVENT_NAME}. While both syntaxes work in bash, GitHub Actions sets this as GITHUB_EVENT_NAME and the standard pattern in GitHub Actions is to use the $GITHUB_EVENT_NAME syntax for consistency with GitHub Actions documentation.

Suggested change

	if [[ "${GITHUB_EVENT_NAME}" != "pull_request" ]]; then
	if [[ "$GITHUB_EVENT_NAME" != "pull_request" ]]; then

[Copilot]

The environment variable should be $GITHUB_EVENT_NAME instead of ${GITHUB_EVENT_NAME}. While both syntaxes work in bash, GitHub Actions sets this as GITHUB_EVENT_NAME and the standard pattern in GitHub Actions is to use the $GITHUB_EVENT_NAME syntax for consistency with GitHub Actions documentation.

Suggested change

	if [[ "${GITHUB_EVENT_NAME}" != "pull_request" ]]; then
	if [[ "$GITHUB_EVENT_NAME" != "pull_request" ]]; then