Truncate assert path

[bevinduckett]

Related Issue(s)	#5122
Has Unit Tests (y/n)	y
Documentation Included (y/n)	n
Generative AI was used in this contribution (y/n)	y

---

Change Description

1. Added the file path leading-truncation for the log() message from reportAssert() and added unit test coverage.
2. Updated the truncation for the file path from the event argument to be leading-truncation (not trailing truncation)
3. Added custom config to the unit test so that file path truncation would be tested (custom configuration)
4. Updated the default value for AssertFatalAdapterEventFileSize to be significantly less than the default value for FwAssertTextSize

Rationale

See feature rationale in #5122

Testing/Review Recommendations

Future Work

We could consider adding a function to StringUtils to do leading-truncation

AI Usage (see policy)

AI (Claude code, Sonnet 4.5) was used to assist with the unit test updates