chore: Update some properties

[DaveTryon]

Details

This PR tidies up some properties that I've noticed in the code:

1. InteractionLevelAttribute.InteractionLevel can be an auto-property
2. BaseTracker.ProcessId can be a protected property instead of an internal field
3. ColorPair can be a little simpler it the foreground color and background color are implemented as properties

Motivation

Code clarity and control

Context

Pull request checklist

• [n/a] Addresses an existing issue:

[codecov-commenter]

Codecov Report

Merging #828 (dbcb1e3) into main (4fc19c3) will increase coverage by 0.98%. The diff coverage is 80.32%.

@@            Coverage Diff             @@
##             main     #828      +/-   ##
==========================================
+ Coverage   73.70%   74.68%   +0.98%     
==========================================
  Files         398      420      +22     
  Lines       12046    12972     +926     
==========================================
+ Hits         8878     9688     +810     
- Misses       3168     3284     +116     

Impacted Files	Coverage Δ
src/Actions/Actions/ControlPatternAction.cs	0.00% <0.00%> (ø)
src/Actions/Actions/CustomUIAAction.cs	0.00% <0.00%> (ø)
src/Actions/Actions/ListenAction.cs	0.00% <0.00%> (ø)
src/Actions/Actions/PrivacyExtensions.cs	100.00% <ø> (ø)
src/Actions/Actions/SetDataAction.cs	0.00% <0.00%> (ø)
...rc/Actions/Attributes/InteractionLevelAttribute.cs	0.00% <0.00%> (ø)
src/Actions/Misc/ExtensionMethods.cs	7.46% <0.00%> (-31.60%)	:arrow_down:
src/Actions/Resources/ErrorMessages.Designer.cs	0.00% <ø> (-55.56%)	:arrow_down:
src/Automation/AxeWindowsAutomationException.cs	33.33% <ø> (-33.34%)	:arrow_down:
src/Automation/Data/OutputFile.cs	88.88% <ø> (ø)
... and 432 more

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