SF-3333b Reduce calls to the DBL, PT, and RTS when configuring sources

[pmachapman]

This PR:

• Improves real time server connection reuse when updating settings
• Reduces the calls made to ParatextData (for Projects) or the DBL (for Resources) for scenarios when:
  • More than one user is on a project or resource
  • A resource or project is used for both the training and translation sources.

Testing Notes:

• Retesting the SF-3333 (SF-3333 Reduce calls to the DBL when configuring sources #3175) acceptance test will be sufficient. This can be done by a developer.
• I have re-run the SF-3208 (SF-3208 Fix resource not showing when user has permission #3013) acceptance test for regressions (it passed)

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.01%. Comparing base (5a0e932) to head (bfa9007).
Report is 100 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3187   +/-   ##
=======================================
  Coverage   83.01%   83.01%           
=======================================
  Files         569      569           
  Lines       33203    33217   +14     
  Branches     5355     5350    -5     
=======================================
+ Hits        27562    27575   +13     
  Misses       4838     4838           
- Partials      803      804    +1     

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[RaymondLuong3]

Reviewed 1 of 2 files at r1, all commit messages.
Reviewable status: 1 of 2 files reviewed, all discussions resolved

[RaymondLuong3]

Reviewed 1 of 2 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @pmachapman)