minor #39923 [SecurityBundle] Remove wrong test (jderusse)

This PR was merged into the 4.4 branch.

Discussion
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[SecurityBundle] Remove wrong test

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

This tests, asserts that all links to logout are identical, which is wrong and incompatible with BREACH mitigation #39919

Commits
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91c360ec75 Remove wrong test