add cypress coverage for manage columns behaviour in hardware conf table

[Philip-Carneiro]

Description

Added cypress coverage to Manage Columns in Hardware Configuration Table

How Has This Been Tested?

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[manaswinidas]

Thanks for adding Cypress coverage for manage columns! A few items to clean up around DRY and redundant assertions.

[manaswinidas]

Informational — library coverage gap

9 of the 16 tests here (toggle, cancel, persist, restore-defaults, search) exercise ManageColumnsModal / useManageColumns behavior from mod-arch-shared. The mod-arch-library repo has test infrastructure (both Cypress and unit) but zero coverage for these components today.

These tests are valuable as the only coverage that currently exists, so not blocking on this — but ideally this coverage should move upstream as unit/component tests in mod-arch-library, leaving only a smoke test + the app-specific latency filter interaction tests here.

[google-oss-prow]

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