Update codecov.io configuration

[sharwell]

• Disable status reports based on coverage
• Disable graphs in pull request comments
• Use the NuGet-sourced uploader instead of Python

[codecov[bot]]

Codecov Report

Merging #58 into master will decrease coverage by 1.58%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   81.75%   80.16%   -1.59%     
==========================================
  Files          36       41       +5     
  Lines        2970     3076     +106     
  Branches      226      205      -21     
==========================================
+ Hits         2428     2466      +38     
- Misses        434      507      +73     
+ Partials      108      103       -5

Impacted Files	Coverage Δ
...sageAnalyzers/Helpers/HelpersResources.Designer.cs	54.16% <0%> (ø)
...nalyzers/AsyncUsageAnalyzers/Resources.Designer.cs	0% <0%> (ø)
...yncUsageAnalyzers/Usage/UsageResources.Designer.cs	21.21% <0%> (ø)
...yzers/Reliability/ReliabilityResources.Designer.cs	29.16% <0%> (ø)
...cUsageAnalyzers/Naming/NamingResources.Designer.cs	21.21% <0%> (ø)
...Analyzers.CodeFixes/Helpers/FixAllContextHelper.cs	52.22% <0%> (+1.67%)	:arrow_up:
...ers.CodeFixes/Helpers/CustomBatchFixAllProvider.cs	74.46% <0%> (+1.92%)	:arrow_up:
...nalyzers.Test/Helpers/DiagnosticVerifier.Helper.cs	80.71% <0%> (+1.99%)	:arrow_up:
...ncUsageAnalyzers.Test/Verifiers/CodeFixVerifier.cs	54.41% <0%> (+2.64%)	:arrow_up:
...geAnalyzers.Test/Helpers/CodeFixVerifier.Helper.cs	90.32% <0%> (+2.82%)	:arrow_up:

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