[chore] Silence memlimit package

[daenney]

Description

The memlimit package started to log any error returned by automemlimit. This updates our implementation to call SetGoMemLimitWithOpts() instead which uses the same defaults as automemlimit except for being initialised with a noop logger.

We check the returned error for a particular substring, as when cgroups isn't available even when running on a Linux system that's not a problem. If it's anything but that error, we log it at the warning level so that admins can still diagnose other cgroup related issues.

Fixes #2983

Checklist

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• I/we have commented the added code, particularly in hard-to-understand areas.
• I/we have made any necessary changes to documentation.
• I/we have added tests that cover new code.
• I/we have run tests and they pass locally with the changes.
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[daenney]

The test failure seems unrelated to this change:

timestamp="12/06/2024 16:51:13.997" func=dereferencing.(*Dereferencer).getAccountByURI level=ERROR msg="error enriching remote account: enrichAccount: error dereferencing https://example.org/users/Some_User: Dereference: GET request to https://example.org/users/Some_User failed: status=\"\" body=\"{\"error\":\"404 not found\"}\""

timestamp="12/06/2024 16:51:17.675" func=workers.(*clientAPI).AcceptFollow level=ERROR msg="error notifying follow: notifyFollow: error notifying follow target 01F8MH17FWEB39HZJ76B6VXSKF: Notify: couldn't retrieve mutes for account 01F8MH17FWEB39HZJ76B6VXSKF: sqlite3: database schema has changed: no such table: user_mutes (code=17 extended=17)"

timestamp="12/06/2024 16:51:17.676" func=workers.(*clientAPI).UndoFollow level=ERROR msg="error updating account stats: decrementFollowingCount: db error updating account stats: sql: database is closed"

timestamp="12/06/2024 16:51:17.676" func=workers.(*clientAPI).UndoFollow level=ERROR msg="error updating account stats: decrementFollowersCount: db error updating account stats: sql: database is closed"

timestamp="12/06/2024 16:51:17.691" func=dereferencing.(*Dereferencer).enrichAccountSafely level=ERROR msg="error updating %s fetched_at: %vhttp://fossbros-anonymous.io/users/foss_satancontext canceled"

timestamp="12/06/2024 16:51:17.691" func=dereferencing.(*Dereferencer).RefreshAccountAsync.func1 level=ERROR msg="error enriching remote account: enrichAccount: error dereferencing http://fossbros-anonymous.io/users/foss_satan: Dereference: GET request to http://fossbros-anonymous.io/users/foss_satan failed: status=\"\" body=\"{\"error\":\"404 not found\"}\""

--- FAIL: TestFromFederatorTestSuite (6.36s)
    --- FAIL: TestFromFederatorTestSuite/TestMoveAccount (3.68s)
        fromfediapi_test.go:635: 
            	Error Trace:	/drone/src/internal/processing/workers/fromfediapi_test.go:635
            	Error:      	Should be true
            	Test:       	TestFromFederatorTestSuite/TestMoveAccount
FAIL

FAIL	github.com/superseriousbusiness/gotosocial/internal/processing/workers	67.873s

Weirdly enough this test passes for me locally with the wasmsqlite3 database driver but not the modernc one. Which just. How.