proposal: testing: Add a way to disable cache for spesific tests

[saberder]

Proposal Details

Add a way disable test cache for spesific tests (ie. t.NoCache() )
Test are a great way to add some sanity checks while programming for things like:

• is my dev env sucesfully logging in correctly to an api
• what is this spesific function currently returning

With cache these usescases get cached and we have to run go clean -testcache every time, and can trick people into thinking that some connection is working, when in reality the function is returning an empty list.
This is preventing us from using vscode golang extention and the play button feature to run spesific tests for these kind of scenarios.

ref: #24573 (comment)
if we could do something like t.NoCache() to mark specific tests. Otherwise everyone will just disable cache altogether with -count=1. I run into this problem when I simply changed sql fixture file, so I would like that specific test to run without caching but I would like to cache others.

[MarvinJWendt]

I like the proposal, but it seems to be a duplicate of #23799 (and #34635, which suggested the same syntax).

[bcmills]

Duplicate of #23799