[WIP] Automatically substitute glean's version in forUnitTest dependencies

[Dexterp37]

This attempts to find the version of the Glean SDK currently being used in projects using the gradle plugin and to add that version as a constraint to any forUnitTest glean dependency available.

Note this is currently lacking the constraint part

Todo:

• Add a dependency constraint to enable using forUnitTest dependencies without a version number
• Remove the changes to .buildconfig.yml
• Add to the changelog

[codecov-io]

Codecov Report

Merging #441 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #441      +/-   ##
============================================
+ Coverage     76.49%   76.51%   +0.01%     
+ Complexity      330      329       -1     
============================================
  Files            96       96              
  Lines          5463     5462       -1     
  Branches        631      631              
============================================
  Hits           4179     4179              
+ Misses          820      819       -1     
  Partials        464      464

Impacted Files	Coverage Δ	Complexity Δ
...ozilla/telemetry/glean/debug/GleanDebugActivity.kt	76.66% <0%> (+0.9%)	6% <0%> (-1%)	⬇️
...in/java/mozilla/telemetry/glean/utils/JsonUtils.kt	83.33% <0%> (+8.33%)	0% <0%> (ø)	⬇️

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[mdboom]

I might be missing something, but I think we have a chicken-and-egg problem here. User libraries would include the Glean plugin by specifying a Glean version. The plugin can then provide a Glean version, but they need to know it in the first place.

(Or maybe I'm just missing something about how this would work in practice...)