🧹 Drop all test main functions from gtest files

[mjcarroll]

All of our tests link gtest_main, so including main functions is redundant.

Signed-off-by: Michael Carroll [email protected]

[codecov]

Codecov Report

Merging #322 (8ecc9d6) into main (c2055f7) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
+ Coverage   77.12%   77.22%   +0.09%     
==========================================
  Files          76       84       +8     
  Lines       10528    10657     +129     
==========================================
+ Hits         8120     8230     +110     
- Misses       2408     2427      +19     

Impacted Files	Coverage Δ
.../include/ignition/common/testing/BazelTestPaths.hh	0.00% <0.00%> (ø)
testing/src/BazelTestPaths.cc	0.00% <0.00%> (ø)
.../include/ignition/common/testing/CMakeTestPaths.hh	100.00% <0.00%> (ø)
...e/ignition/common/testing/detail/AutoLogFixture.hh	100.00% <0.00%> (ø)
testing/src/Utils.cc	80.00% <0.00%> (ø)
...sting/include/ignition/common/testing/TestPaths.hh	100.00% <0.00%> (ø)
testing/src/TestPaths.cc	78.37% <0.00%> (ø)
testing/src/CMakeTestPaths.cc	100.00% <0.00%> (ø)
src/PluginLoader.cc	97.67% <0.00%> (+1.55%)	⬆️
src/TempDirectory.cc	81.48% <0.00%> (+4.91%)	⬆️

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