mozilla-releng / balrog / #3036

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Add support for Update Pinning (#2534)

Ref: https://bugzilla.mozilla.org/show_bug.cgi?id=1762986

This lets clients specify a major or major.minor version beyond which they should not update.

To support this:
* add `pinnable_release` and associated tables and permissions
* add `PinVersion` class: written as `{major}.` or `{major}.{minor}.`, and supports comparison with StrictVersion
* add `set_pinnable` API with support for scheduled changes and enacting them via the agent
* add pin support in `evaluateRules` and public API: if normal rule evaluation yields a release with greater version than allowed by the pin, look up the `pinnable_releases` table instead
* prevent deletion of releases referenced by `pinnable_releases`

Note: there is currently no API to remove an entry from the `pinnable_releases` table, or to query that table.

Co-authored-by: Julien Cristau <jcristau@mozilla.com>
Co-authored-by: bytesized <bytesized@mozilla.com>

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