manually release ITypeInfo references (missed one)

[weltkante]

Fixes #3305
Relates to #3271

Proposed changes

Release ITypeInfo RCW manually instead of letting the GC clean up. Original PR #3315 missed one reference, this generally made the test run more stable but it was still flaky.

Customer Impact

Tests should become more stable regardless how they are run

Regression?

Yes (after merging PR #3276)

Risk

no known risk

Before

Tests start failing after PR #3276
Test were still failing occasionally after PR #3315

After

Tests should succeed even more before and after PR #3276

Test methodology

• Locally running (a lot of) tests with PR update Xunit.StaFact to include bugfixes #3276
• Running PR update Xunit.StaFact to include bugfixes #3276 with this fix on the CI machine (this PR is extracted from the nuget package update since it may still need some time)
• going through the test file and looking for ITypeInfo references

Test environment(s)

local & CI

Microsoft Reviewers: Open in CodeFlow

[weltkante]

Wow it shows it was late last night, actually missed a second one outside the tests we were looking at.

Now did the smart thing and used 'Find References' command ...

[codecov]

Codecov Report

Merging #3321 into master will increase coverage by 34.00447%.
The diff coverage is n/a.

@@                 Coverage Diff                  @@
##              master       #3321          +/-   ##
====================================================
+ Coverage   64.68672%   98.69119%   +34.00447%     
====================================================
  Files           1318         430         -888     
  Lines         484206      230439      -253767     
  Branches       39910        3142       -36768     
====================================================
- Hits          313217      227423       -85794     
+ Misses        165617        2385      -163232     
+ Partials        5372         631        -4741     

Flag	Coverage Δ
#Debug	98.69119% <ø> (+34.00447%)	⬆️
#production	?
#test	98.69119% <ø> (ø)