MAST: MastMissions improvements

[snbianco]

This PR includes some improvements for our MastMissions class:

• Results returned from MastMissions metadata query functions now include search parameters in the metadata of the astropy.table.Table object and column descriptions in the column metadata.
• Added pass_id as an alias for the Roman mission's pass column in query functions to avoid conflicts with
  the reserved Python keyword.
• Refactored download_products so that when a user inputs a JSON file from the subscription service, the value of mission is taken from the data. This will allow users to download products from multiple missions in a single call.
• Fix in our test_mast.py file where a directory was being created outside of the test environment.

[codecov]

Codecov Report

❌ Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.23%. Comparing base (e3702c4) to head (a0ec925).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
astroquery/mast/missions.py	95.23%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3588   +/-   ##
=======================================
  Coverage   73.22%   73.23%           
=======================================
  Files         226      226           
  Lines       21000    21010   +10     
=======================================
+ Hits        15378    15386    +8     
- Misses       5622     5624    +2     

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[snbianco]

For your awareness: @sedonaprice @bmorris3 @ttdu