feat(manager/pip-compile): Change fileMatch behaviour to target pip-compile output files

[not7cd]

This is a breaking change, although this manager is in its alpha stage.
I'm looking for input regarding tests. I might revert use of commander.js as command parser, as this is a bit unorthodox.

Changes

Now package files are infered from command embeded in output file header. This should enable support for additional package managers that use files like setup.py, setup.cfg and those conforming to PEP 621.

Command extraction from header has been moved to common module, as it will be reused in lockedDependencyUpdate and other functions.

Context

See discussion: #24725 (comment)

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[not7cd]

Regarding failing tests, I suppose that there is an assupmtion of default command being returned by constructPipCompileCmd. I will look into this later.

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[viceice]

please merge main to remove the refactor changes from this PR 🤗

[not7cd]

I have created a migration based on all relevant fileMatch values found with this query.
https://github.com/search?q=%22pip-compile%22+AND+%22fileMatch%22+path%3A**%2Frenovate*&type=code&p=5

[viceice]

otherwise LGTM

[viceice]

see comment

[renovate-release]

🎉 This PR is included in version 37.187.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 37.187.0

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