xds/resolver: change tests to update all resources

[eshitachandwani]

Change the tests in xds resolver to update all resources in management server instead of only listener and route resource.

This change is being done as part of gRFC A74 : xDS Config tears. This is to make sure the tests pass after the change too.

RELEASE NOTES: None

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.00%. Comparing base (b0bc6dc) to head (4c970ff).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8539      +/-   ##
==========================================
- Coverage   82.09%   82.00%   -0.10%     
==========================================
  Files         412      412              
  Lines       40453    40465      +12     
==========================================
- Hits        33211    33184      -27     
- Misses       5869     5904      +35     
- Partials     1373     1377       +4     

see 30 files with indirect coverage changes

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[easwars]

Do we need to skip validation here? We do that in configureResourcesOnManagementServer because we don't specify all resources there.