Update to latest Resharper version (and related formatting improvements)

[bkoelman]

This PR updates to the latest Resharper version. However, the InspectCode/CleanupCode steps are being skipped in cibuild on Linux due to this bug.

Part of this PR is improved formatting support:

• Fixes an inconsistency in casing rules between Resharper and vanilla Visual Studio
• Rider users can now run a full solution format, which properly formats .csproj files
• There's no more need to tweak system-level settings in Rider, such as disabling .editorconfig support

Additionally, this PR simplifies argument null checks in code.

As usual, see the individual commits for details.

QUALITY CHECKLIST

• N/A: Changes implemented in code
• Complies with our contributing guidelines
• N/A: Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

Merging #1191 (292fb45) into master (79d918a) will increase coverage by 0.02%.
The diff coverage is 98.98%.

@@            Coverage Diff             @@
##           master    #1191      +/-   ##
==========================================
+ Coverage   92.59%   92.61%   +0.02%     
==========================================
  Files         242      242              
  Lines        7706     7701       -5     
==========================================
- Hits         7135     7132       -3     
+ Misses        571      569       -2     

Impacted Files	Coverage Δ
...piDotNetCore/Diagnostics/AspNetCodeTimerSession.cs	15.38% <50.00%> (ø)
src/JsonApiDotNetCore.Annotations/ArgumentGuard.cs	80.00% <60.00%> (+6.66%)	⬆️
...c/JsonApiDotNetCore/Configuration/ResourceGraph.cs	72.88% <66.66%> (ø)
...onApiDotNetCore.Annotations/CollectionConverter.cs	90.90% <100.00%> (ø)
...tNetCore.Annotations/Configuration/ResourceType.cs	96.77% <100.00%> (ø)
...ons/Resources/Annotations/RelationshipAttribute.cs	100.00% <100.00%> (ø)
...ns/Resources/Annotations/ResourceFieldAttribute.cs	65.00% <100.00%> (ø)
...tations/Resources/Internal/RuntimeTypeConverter.cs	89.18% <100.00%> (ø)
...rc/JsonApiDotNetCore.Annotations/TypeExtensions.cs	91.66% <100.00%> (ø)
...AtomicOperations/EntityFrameworkCoreTransaction.cs	100.00% <100.00%> (ø)
... and 138 more

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[bkoelman]

@maurei Can you verify if the reformat works properly in Rider for macOS?

1. Rider > Search everywhere: type "restore" > tab Actions > Restore default settings...
2. Checkout branch for this PR
3. Run git clean -xdf on repo root
4. Open JsonApiDotNetCore.sln in Rider, rebuild
5. Restart Rider and rebuild (this makes the squiggles go away, because the first time, source generators weren't yet compiled)
6. Rider > Search everywhere: type "cleanup" > tab Actions > Reformat and Cleanup... > select "Whole Solution" with "JADNC Full Cleanup" profile > Run
7. Rider > File > Save All
8. Run git status and verify it prints "nothing to commit, working tree clean"

[maurei]

Confirmed: it works as desired.