Added query selector classes, fixed some recurring bugs

[jongpie]

Enhancements
This PR is primarily focused on adding some optimizations & cleanup as pre-work to implementing some stellar suggestions from @LawrenceLoz that will be implemented as part of #311 (originally discussed in #303)

• Added new Apex selector classes LoggerEngineDataSelector and LogManagementDataSelector to centralize (almost) all queries throughout the codebase
• Added new Apex class LoggerCache to centralize caching of query results

Bugfixes

• Possibly fixed an issue discussed in Separate Queueable runs are collected into one Log__c record #310 with @reitffunk by reverting to only using a UUID for the transaction ID (instead of using System.Request.getCurrent().getRequestId())
• Fixed Failing tests due to DUPLICATE_USERNAME #313 reported by @jverelst by switching to using a combination of Logger's transaction ID + an incremented counter to dynamically creating unique usernames during tests. This should ensure that the generated username is unique both within a transaction, and across all Salesforce orgs
• Fixed LoggerEmailUtils_Tests failed #276 (again) by moving when an email is added to the constant LoggerEmailSender.SENT_EMAILS, which was previously causing test failures in orgs with email deliverability disabled.
  • Scratch orgs also can't have deliverability disabled (very frustrating), so I also separately changed email deliverability to 'System Email Only' in the pkg demo org that's used in the pipeline, which should help ensure everything is working going forward 🤞
• Added missing access to the class LoggerSObjectMetadata to permission sets 'LoggerAdmin' and 'LoggerLogViewer'
  • This solves an issue in orgs where Apex access is enforced - without the class access, the Logger Settings tab/LWC would throw an error on page load
• Changed the approach used to originally to solve Site Guest User no longer creating logs #219 by using the User Type (UserInfo.getUserType()) of the user's profile, which seems to be a more stable option than the old approach of checking the profile's user license name
  • This was originally reported months ago by @solo-1234, who encountered this issue again. I was not able to reproduce the issue, but using User Type seems like a better approach anyway, and will hopefully resolve any lingering issues with the Guest User
  • I tried to find an option that didn't rely on a hardcoded String, but so far, have not found any other way to determine it

Metadata Cleanup

• Deleted some deprecated LoggerParameter__mdt records - these were deprecated in v4.7.1, but I forgot to remove them from the repo/package
• Eliminated layer-specific test suites within core - as of v4.7.1, the tests are super fast anyway, so the 'LoggerCore' test suite covers everything + makes maintenance easier
• Moved the 'LoggerLogCreator' permission set back to being part of the logger-engine layer

Async Failures plugin

• Added a missing CMDT record LoggerSObjectHandler.BatchApexErrorEvent for the async failures plugin (and created a new package version that includes the CMDT record)

[codecov]

Codecov Report

Merging #314 (4ac7314) into main (7c6f49c) will decrease coverage by 0.08%.
The diff coverage is 91.05%.

❗ Current head 4ac7314 differs from pull request most recent head ee8bd63. Consider uploading reports for the commit ee8bd63 to get more accurate results

@@            Coverage Diff             @@
##             main     #314      +/-   ##
==========================================
- Coverage   95.52%   95.44%   -0.09%     
==========================================
  Files          45       49       +4     
  Lines        4651     4738      +87     
  Branches       92       92              
==========================================
+ Hits         4443     4522      +79     
- Misses        205      213       +8     
  Partials        3        3              

Flag	Coverage Δ
Apex	96.00% <91.05%> (-0.12%)	⬇️
LWC	91.81% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ore/main/log-management/lwc/logViewer/logViewer.js	86.76% <ø> (ø)
...ore/main/logger-engine/classes/LoggerDataStore.cls	100.00% <ø> (ø)
...-logger/core/main/logger-engine/classes/Logger.cls	94.60% <40.00%> (-0.38%)	⬇️
...er/core/main/log-management/classes/LogHandler.cls	98.55% <71.42%> (-0.02%)	⬇️
...in/log-management/classes/LogEntryEventHandler.cls	95.01% <82.35%> (-0.52%)	⬇️
...ain/logger-engine/classes/LogEntryEventBuilder.cls	97.02% <86.04%> (+0.43%)	⬆️
.../main/log-management/classes/LoggerEmailSender.cls	93.25% <87.50%> (+0.15%)	⬆️
...logger-engine/classes/LoggerEngineDataSelector.cls	87.71% <87.71%> (ø)
...re/main/log-management/classes/LogEntryHandler.cls	95.34% <100.00%> (-0.24%)	⬇️
...g-management/classes/LogManagementDataSelector.cls	100.00% <100.00%> (ø)
... and 6 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7c6f49c...ee8bd63. Read the comment docs.