[release-v2.10] Move helm charts from rancher/charts to /charts dir

[pratikjagrut]

PR Description

We're integrating the Auto Chart Bumps feature into the System Upgrade Controller (SUC) repository to streamline chart maintenance and align with Rancher's release structure.

Why This Change?

• Currently, the SUC chart resides in rancher/charts, but due to strict requirements, we need a separate repo for managing SUC chart.
• One key requirement is maintaining three active release branches for Rancher, which makes it difficult to continue hosting the chart in the rancher/charts repository.
• Instead of creating a new repository, we've decided to host the SUC chart in a dedicated branch within the existing SUC repo.
• We'll use the same branch for all three active releases instead of three branches.

What’s Changing?

• A new branch, rancher-charts-release/v2.10, will be used exclusively for SUC charts.
• All new PRs for the Rancher SUC chart will be created in this branch instead of rancher/charts.
• This branch will only contain the SUC chart files, not the SUC source code.
• The auto chart bump mechanism will automatically watch this branch and update charts.

Related issue: #49087.

[brandond]

v0.14.2 is from October, can we use something newer?

[snasovich]

This matches the version used in v2.10.x release line (https://github.com/rancher/charts/blob/dev-v2.10/charts/system-upgrade-controller/105.0.1/values.yaml#L8) so we're just matching that.
Bumping SUC version is out of scope for this effort.