[CI] Add external renderer tests for combined formats

• Related issues: #1333 (closed)
• Requested reviewers: @vasilache, @tyagiri, @norvell

Reason why this change is needed

• Add test coverage for combined formats for the renderer tests, both for standalone rendering and split rendering

Description of the change

• Added the standard test cases for both OSBA and OMASA covering rendering to non-binaural formats, binaural and binaural with headrotation.
• Added external split rendering testcases
  • An issue was found for OMASA, see #1334 (closed)
• Made internal format names more consistent with the IVAS naming scheme (ISMx{MASA,SBA}y instead of O{MASA,SBA}_x_y)
  • A minor update was needed for the split rendering tests to accomodate this
  • The old naming is still present for binauralize_input_and_output() and was left untouched
• Removed skipping of rendering to BINAURAL_ROOM variants for MASA, as this is now implemented and should be tested
• Formatting and linting

Affected operating points

• Tests for external renderer (smoke test, BE test), external split rendering