Set max-parallel to matrix in jobs

[echoix]

Should help when we are running out of runners. These are just a naive estimation of what could be useful. We could probably better tune these later easily, if we feel that a certain matrix is too long because of these limits, and that it doesn't end up having too long of a queue in busy (contribution-wise) times.

https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategymax-parallel

The branch on my fork was failing for some tests of sfdx

Proposed Changes

1. Set strategy: max-parallel: to workflows with a job matrix

Readiness Checklist

Author/Contributor

• Add entry to the CHANGELOG listing the change and linking to the corresponding issue (if appropriate)
• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[echoix]

The branch on my fork was failing for some tests of sfdx

[echoix]

🦙 MegaLinter status: ⚠️ WARNING

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[nvuillam]

Plz check comments :)