What does this MR do?
This makes sure the Open/Close button on an issuable page uses a relative URL.
This avoids problems when gitlab is used behind a proxy and the URL specified in gitlab.rb isn't the one used to access gitlab.
As documented by @stwink86 in #35822 (closed)
Why was this MR needed?
To avoid issues CSRF issues when gitlab is used behind a proxy.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Review
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Has been reviewed by Backend
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What are the relevant issue numbers?
Closes #35822 (closed)