[Tests-Only] Fix replacement usernames

[phil-davis]

Description

When I do an acceptance test run with replacement usernames I get various test fails because some recently-added scenarios are not abstracting the username in the required places. So, for example, "Alice" is replaced with username "000" in PR #37506 but some Then steps fail because they expect hard-coded "Alice" when they should be expecting %username% which will be substituted at run-time for the actual replaced username.

• Fix these so that they work properly when replacing the username.
• Add some log output at the beginning of a test run when REPLACE_USERNAMES is defined. Show the username and user attribute replacements so that we know what was happening when we later lok at the log output.

How Has This Been Tested?

CI in PR #37506 passes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[codecov]

Codecov Report

Merging #37706 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37706   +/-   ##
=========================================
  Coverage     64.71%   64.71%           
  Complexity    19386    19386           
=========================================
  Files          1283     1283           
  Lines         75730    75730           
  Branches       1333     1333           
=========================================
  Hits          49008    49008           
  Misses        26330    26330           
  Partials        392      392           

Flag	Coverage Δ	Complexity Δ
#javascript	54.03% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.89% <ø> (ø)	19386.00 <ø> (ø)

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[dpakach]

LGTM 👍