Draft: Backport of "isomp4/matroska: Add `stream-format = (string) obu-stream` to AV1 caps" into 1.20

Backport of !3740 (merged) "isomp4/matroska: Add stream-format = (string) obu-stream to AV1 caps".

Todo:

  • Needs manual intervention, cherry-picking failed!

Commits:

  • 4c8141a0 isomp4: Add stream-format = (string) obu-stream to AV1 caps
  • 067b5d92 matroska: Add stream-format = (string) obu-stream to AV1 caps

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