fix(platform): Filter out non-Renovate PRs with same branch

[zharinov]

Closes #5188

[rarkins]

@zharinov what tests have you been able to do so far? e.g. were you able to reproduce the problem in old code then see it's fixed in new?

[viceice]

Shouldn't we try to fetch only our PR's? Then we don't need that check.

[rarkins]

Right now we fetch all open ones in case one is a Renovate reconfiguration PR that we need to validate

[rarkins]

I’m tempted to deprecate that capability and make it a separate module to keep core renovate simpler

[zharinov]

@zharinov what tests have you been able to do so far? e.g. were you able to reproduce the problem in old code then see it's fixed in new?

I tested on this example, it updates different PRs depending on master vs fix branch. I also validated this result with debugger run.

[rarkins]

• Need to check that this doesn't break "forkMode" because Renovate's PRs come from another repo

[zharinov]

Okay, seems like it's ready for review

[renovate-release]

🎉 This PR is included in version 19.111.1 🎉

The release is available on:

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

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