Craft-parts

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- Fix git repository updates
- Fix stage packages removal on build update

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- Fix stdout leak during snap package installation
- Fix plugin validation dependencies

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- Add support for application-defined environment variables
- Add package filter for core22
- Refresh packages list before installing packages
- Expand global variables in parts definition
- Adjust prologue/epilogue callback parameters
- Make plugin options available in plugin environment validator
- Fix readthedocs documentation generation

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- Fix stage package symlink normalization

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- Add zip source handler
- Clean up source provisioning
- Fix project variable setting for skipped parts

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- Fix extra build snaps installation