[8.12] Update apm data (backport #12242)

[mergify]

This is an automatic backport of pull request #12242 done by Mergify.
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Changes to be committed:
	modified:   NOTICE.txt
	modified:   changelogs/8.12.asciidoc
	modified:   internal/beater/api/intake/handler_test.go
	deleted:    internal/beater/api/intake/test_approved/BodyReader.approved.json
	new file:   internal/beater/api/intake/test_approved/EmptyBody.approved.json
	modified:   internal/beater/api/intake/test_approved/FullQueue.approved.json
	modified:   internal/beater/api/intake/test_approved/FullQueueLegacy.approved.json
	deleted:    internal/beater/api/intake/test_approved/integration/rum/TestRUMHandler_KillSwitchMiddleware/On.approved.json
	deleted:    internal/beater/api/intake/test_approved/integration/rum/TestRUMHandler_NoAuthorizationRequired.approved.json
	modified:   internal/beater/api/mux_intake_rum_test.go
	modified:   systemtest/rum_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.mod
	both modified:   go.sum

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[endorama]

I manually tested this PR for elastic/apm-data#174, one of the included fixes. I can confirm apm-server correctly respond to empty requests without failures.

[carsonip]

Tested this PR for elastic/apm-data#181. Although errors are wrapped and returned by apm-data, apm-server tries to unwrap into InvalidInputError (see code), which skips over all the additional context. Therefore, most of the changes in apm-data that affects InvalidInputError have no user-facing changes. As flagged by @kyungeunni , it affects error like:

{
    "accepted": 0,
    "errors": [
        {
            "message": "cannot handle stream: cannot process batch: unauthorized: anonymous access not permitted for agent \"java\""
        }
    ]
}

I agree with @simitt that as there is no additional sensitive info, this is fine.