Flaky test on CI: `search-tab-change-title-fn-sig.goml`

[JohnTitor]

The failure is:

/checkout/src/test/rustdoc-gui/search-tab-change-title-fn-sig.goml search-tab-change-title-fn-sig... FAILED
[ERROR] (line 6) Error: The following CSS selector "#titles" was not found: for command `wait-for: "#titles"`
Build completed unsuccessfully in 0:00:47

That test has failed several times:

• Only allow compiletest to use feature(test), not any other feature #97410 (comment)
• Rollup of 5 pull requests #97717 (comment)
• Rollup of 6 pull requests #98144 (comment)

[JohnTitor]

Another case: #99305 (comment)

[GuillaumeGomez]

It's all linked to the search. I wonder if we're entering things too fast...

[JohnTitor]

Maybe we could do some retry such a case?

[GuillaumeGomez]

I have a better idea. :)