[11.x] Do not overwrite existing link header(s) in AddLinkHeadersForPreloadedAssets
middleware
#53463
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When looking into adding some manual
Link
headers for some static assets, I noticed I could not manage to add any when theAddLinkHeadersForPreloadedAssets
is active. This PR alters the behavior to not overwrite theLink
header, but rather add to it. This ensures developers have the opportunity to also addLink
headers of their own within the scope of their application logic.I also reversed an expected vs. actual ordering in an existing test.