feat(manager/copier): Implement manager

[lkubb]

Changes

• Adds support for updating Copier templates
• Adds one self-hosted (copierTrust) and one repository configuration (copierOptions, with several children)

Context

Closes #25556

• This implementation does not support git@github.com:some/repo-style URLs (I don't think they are used widely though)
• It does not fail when the smart update algorithm results in merge conflicts, they are not always reliable. It adds a warning when a file is reported to have conflicts though.

Note: This is my first PR to a TypeScript project in general and I have limited prior experience with Renovate. I read the contribution guidelines and tried to follow existing examples, but copier is not a regular manager, so I hope this is how it should be done.

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

[viceice]

why do we need so many new config options? we don't have it for any other managers

[lkubb]

why do we need so many new config options? we don't have it for any other managers

I'd argue that Copier is somewhat different from other managers because it can impact each file in the repository in relatively dynamic ways. Also honestly, I tend to lean towards providing more configurability to users when it does not add significant complexity, but am not married to most of the options.

I believe copierTrust (without this, some templates are unmanageable), data (for centrally updating some variables) and likely recopy (if merge conflicts should be avoided at all cost) are essential.

skip and exclude can help address specific annoying quirks (in some generated projects, example files are re-added even if they have been removed from the repository or can cause merge conflicts). dataFile and skipTasks are probably expendable and could be removed if we want to simplify the configuration.

[rarkins]

We need to go back to the discussion for all of this. It's undesirable to bloat the configs with so many new options so we should discuss them one by one and reach agreement chest.

[lkubb]

Please see my post in the discussion for a detailed context on each option.

(Sorry, posted in the issue first, corrected)

I have removed all Copier-specific options.

[viceice]

Blocked by containerbase/base#2870

[renovate-release]

🎉 This issue has been resolved in version 38.19.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 38.19.0

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