Fix tests for recent broader-options watch plugins PR

[tdd]

Summary

A test inside #6473 was unfortunately incorrect and "passed by mistake". This was due to the TTS or an it.each call not using interpolation on dynamic scenario variables, mostly. This fixes it.

Additionally, in the meantime an extra call to updateGlobalConfig had been added to each watch test run, making the original test obsolete in its mock calls inspection. Updated.

Test plan

Well, the tests keep passing, only this time they're correct 😉 so they're actually exercising the scenarios.

Ping @rogeliog @thymikee @SimenB for review.

Refs #6693

[codecov-io]

Codecov Report

Merging #6696 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6696      +/-   ##
==========================================
+ Coverage    63.6%   63.71%   +0.11%     
==========================================
  Files         235      235              
  Lines        8998     8998              
  Branches        3        3              
==========================================
+ Hits         5723     5733      +10     
+ Misses       3274     3264      -10     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-cli/src/lib/update_global_config.js	95.45% <0%> (+22.72%)	⬆️

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[github-actions]

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