Make a `/version-bump` slash command that bumps versions of changed connectors in a PR

[natikgadzhi]

Problem

When Dependabot makes a PR into a Python source, it changes only pyproject.toml and poetry.lock.

To merge such a PR, we need a few things:

• Make it run CI and make sure it passes. #airbyte-internal-issues/6979
• Bump the version (this issue)

I think we have a version bump command in airbyte-ci, so let's do two things:

1. Provide a new slash command /version-bump that bumps the version of affected connectors
2. Make sure that this flow is triggered automatically for PRs from dependabot (separate issue).

Acceptance criteria

• /version-bump connector-name [--version patch | minor | major] [--message ...] slash command that:
  • determines the list of changed connectors
  • posts a comment to the issue that tracks it's execution (like /format-fix)
  • bumps the version of a connector in pyproject.toml
  • bumps the version of a connectors in metadata.yaml (key dockerImageTag)
  • adds a changelog line to docs (docs/integrations/{connector-name}.md if it exists, but does not fail if it does not exist.

Impact

Once we have this, @ChristoGrab's work and @btkcodedev and @pabloescoder's work will be MUCH easier. And @marcosmarxm will be very happy — we will eliminate the next biggest time hog in accepting community contributions.

[marcosmarxm]

bumps the version of a connector in pyproject.toml

it is possible to also run poetry lock?

[natikgadzhi]

@marcosmarxm yep: https://github.com/airbytehq/airbyte/issues/41070