[charts] auto chart-bump improvements

[nicholasSUSE]

The auto-chart-bump is executed manually using the charts-build-scripts.

This will be the list of improvements to implement before we can make this feature mandatory for every chart owner and make an announcement company-wide.

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Improvements

1. Implement auto-trigger at chart-bump.

When a new PR is merged on the chart upstream repository, this must trigger a new auto chart-bump at the charts repository.

This must be done with @pjbgf approval, the strategy that will be implemented must not generate security risks.

This must be documented in the Wiki before the announcement.

After the company-wide statement the Chart owners will be responsible for implementing their part of the integration in their upstream repositories respectively.

2. When a new chart-bump occurs, the last release.yaml entry for that chart must be removed before a new one is added.

3. The feature currently is hard-coded only for dev-v2.10 branch, expand the functionality for the newer lines that might come (e.g., dev-v2.11; dev-v2.12....)