MAINT: raise more errors earlier

[bsipocz]

So we don't end with red herring errors like when we try to parse an error response into a votable. E.g. I got a KeyError: 'RA(h)' while working on a fix for #3282 all the while the actual problem was a super clear 404

HTTPError: 404 Client Error: Not Found for url: https://ssp.imcce.fr/webservices/skybot/skybotconesearch_query.php?-ra=0.0&-dec=0.0&-rd=0.3&-ep=2458291.893831018&-loc=G37&-filter=0.1&-objFilter=111&-refsys=EQJ2000&-output=all&-mime=text

[keflavich]

Strong approve. I try to do this every time I use requests, but I guess we just missed this case.

[bsipocz]

Apparently I need to do some fixup here, it's great when something feels so simple that I don't even bother with running the tests locally and then have a big faceplant 😂

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.37%. Comparing base (f021816) to head (f8d5bfc).
Report is 169 commits behind head on main.

Files with missing lines	Patch %	Lines
astroquery/utils/process_asyncs.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3284      +/-   ##
==========================================
- Coverage   69.38%   69.37%   -0.01%     
==========================================
  Files         232      232              
  Lines       19682    19689       +7     
==========================================
+ Hits        13656    13659       +3     
- Misses       6026     6030       +4     

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