Merge the INSAR_ISCE_MULTI_BURST job spec with INSAR_ISCE_BURST

[jtherrmann]

Jira: https://asfdaac.atlassian.net/browse/TOOL-3145

Note: The above link is accessible only to members of ASF.

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Currently we have an INSAR_ISCE_MULTI_BURST job spec (which takes reference and secondary parameters) and a separate INSAR_ISCE_BURST job spec (which takes a granules parameter) because it was the easiest way to merge the multi-burst work to main without breaking backwards compatibility for INSAR_ISCE_BURST.

For this issue, we'll want to merge the two job specs as follows:

• Add the granules parameter to INSAR_ISCE_MULTI_BURST.yml and enforce that either granules or reference and secondary must be used.
  • We can probably do this via OpenAPI's oneOf keyword (see https://swagger.io/specification/#discriminator-object and https://stackoverflow.com/a/25637397), which would require modifying our job spec parsing here
• Rename INSAR_ISCE_MULTI_BURST.yml to INSAR_ISCE_BURST.yml (replacing the existing INSAR_ISCE_BURST.yml)
• Rename the job type to INSAR_ISCE_BURST (first line of the job spec)
• Limit reference and secondary each to length 1 (this can be changed back to 30 in the hyp3-multi-burst-sandbox deployment for testing purposes)
• Remove INSAR_ISCE_MULTI_BURST.yml from hyp3-multi-burst-sandbox deployment
• Currently the validate_jobs function calls convert_single_burst_jobs to convert the parameters for all INSAR_ISCE_BURST jobs from granules to reference and secondary in validation.py. This will need to be updated to only perform the conversion if the job has a granules parameter. Or we could just handle the granules parameter in the actual validator functions that use the burst granule names (currently that should just be the check_same_burst_ids validator), which is probably the better option.
• Rename INSAR_ISCE_MULTI_BURST to INSAR_ISCE_BURST everywhere it's used in the code (see git grep INSAR_ISCE_MULTI_BURST); should just be set_batch_overrides.py, test_set_batch_overrides.py, and test_validation.py
• Add a note to the Changelog that granules is now deprecated for INSAR_ISCE_BURST