Wrapping up the leftover tasks in xblocks-extra, prepare for the release

[farhan]

Ticket: #16

Reference PR's: while shifting to uv and writing upgrade-python-requirements.yml

openedx/openedx-aspects#340
openedx/xqueue-watcher#122

Tasks done in this PR:

• License should be created/moved at the root
• License has been added copied from xblocks-contrib repo
• License should be bundled in the packaging
• Implement python upgrade workflow
• Move to uv (from pip)
• How the common constraints for edx repos will be applied -c https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt
• No need to implement it
• catalog-info.yaml should be created at the root
• Are we going to move openedx.yaml For example
• PACKAGE DATA should be revised for all the xblocks as we are not shifting the packaging strategies for example
• i18n should be supported, translations commands in make file is pending to add
• Testing of docs is pending
• Make sure all the readme content of the xblocks has been moved to the xblocks-extra repository. We should create different read-me files for different blocks in their directories for isolation and easy maintenance.
• We should reference the inter block readmes to the main readme file and list the xblocks repo will contain.
• We should also make sure all the migrated XBlocks have been marked deprecated and archived before closing this epic.
• What about the issues created in the main repositories, should we move them all, I think so.
• What about the un-merged PR's, I think as soon as we make xblocks-extra ready, publish it on pypi, we can drop message on the PR's to shift their PR's.
• Adding @kdmccormick comment on xblocks-extra:

We should make sure:

Existing sites will be able to uninstall the old packages and install xblocks-extra seamlessly.
There will be documentation explaining that to them.
Both the old repos and xblocks-extra work in Verawood, so that they have a full release to transition.

• Write transition/migration notes for the Verawood open edx release

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.98%. Comparing base (2f72077) to head (e24427d).

Additional details and impacted files

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##             main      #27   +/-   ##
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  Coverage   86.98%   86.98%           
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  Files           7        7           
  Lines         269      269           
  Branches       23       23           
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  Hits          234      234           
  Misses         31       31           
  Partials        4        4           

Flag	Coverage Δ
unittests	86.98% <ø> (ø)

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