Ignore execution time errors for schemadiff view analysis

[dbussink]

The UnsupportedConstruct error is returned for execution of select queries inside vtgate, but when we analyze views we don't care about those.

Views here are executed at the MySQL level though and always inside a single shard, so we don't want to return these errors.

The test example here shows a case where it thinks it's in sharded mode because of a missing dependency, but we only want to show that we're missing a table dependency.

Related Issue(s)

Part of #10203

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.80%. Comparing base (71b2cae) to head (10b6758).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17704      +/-   ##
==========================================
+ Coverage   67.77%   67.80%   +0.02%     
==========================================
  Files        1587     1587              
  Lines      255798   255830      +32     
==========================================
+ Hits       173379   173474      +95     
+ Misses      82419    82356      -63     

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