[pageHeader]: refactor and fix avt tests on pageHeader.

[devadula-nandan]

Package

Carbon for IBM Products

Description

the pageHeader avt needs to be refactored.
the shard 3 avt in ci checks shows as passed, but when we check the logs, 3 were shown flaky in this run. as below.

need to investigate/fix it.

Component(s) impacted

none, only the test

Browser

No response

@carbon/ibm-products (previously @carbon/ibm-cloud-cognitive) version

v2.49.0-rc.0

Suggested Severity

Severity 4 = The problem is not visible to or noticeable to an average user. Affects minor functionality, no workaround needed.

Product/offering

C4IP

CodeSandbox or Stackblitz example

https://github.com/carbon-design-system/ibm-products/actions/runs/10702823969/job/29671907237?pr=5929\

Steps to reproduce the issue (if applicable)

No response

Release date (if applicable)

No response

Code of Conduct

• I agree to follow this project's Code of Conduct
• I checked the current issues for duplicate issues