Make `/upgrade-cdk version={VERSION}` slash command

[natikgadzhi]

Problerm

Sometimes we'd need to change a version of the CDK in a PR from a community engineer, and now we need to run poetry lock for the PR to be good. It's additional back and forth and it would be good to automate it away, just like /format-fix.

Solution

A new slash command! Initially we thought of /poetry-lock, but decided against it:

A command that takes the changes in the PR, and for all python packages that have changes in this pull request, it runs poetry lock, and commits the resulting changes back to the PR.

So instead, we'll implement /upgrade-cdk command that takes a PR and version in, and:

• Upgrades CDK in a Poetry-based connector: poetry add airbyte-cdk@VERSION or latest.
• Runs poetry lock --no-update to ensure no other dependencies drift.
• Commits the change back into the PR in question.

How to build it

• Use /format-fix as an example
• Our github workflows already have an action to determine the list of python packages that have changes in the PR — look at airbyte CI for internal poetry packages or around connectors.
• Fetch the list of connectors with changes, and run airbyte-ci upgrade-cdk on them

[natikgadzhi]

After a good discussion with @inossidabile, we decided that doing /poetry-lock might be too wide and dangerous with unexpected consequences, so instead we will use /upgrade-cdk with specific CDK version provided.

As a prerequisite, there is an internal repo issue to get the current implementation of airbyte-ci upgrade-cdk command to work with Poetry-based connectors: https://github.com/airbytehq/airbyte-internal-issues/issues/8648

Assuming this gets done, the slash command for this issue would wrap that airbyte-ci command.

[natikgadzhi]

Since most connectors are moving to manifest-only, this is suddenly much lower value.