config/secret: deflake TestAddWithParser

[MadhavJivrajani]

This commit does 2 main things to deflake TestAddWithParser:

1. Ensure that we wait a sufficient amount for the secret to be reoloaded.
2. Try using the last modification time of the initial secret parse. Without this, the parsing function used in the test ends up with duplicates in the channel and we get flakes.

❯ stress ./secret.test -test.run=^TestAddWithParser$
5s: 16 runs so far, 0 failures
10s: 32 runs so far, 0 failures
15s: 48 runs so far, 0 failures
20s: 64 runs so far, 0 failures
25s: 80 runs so far, 0 failures
30s: 96 runs so far, 0 failures
35s: 112 runs so far, 0 failures
40s: 128 runs so far, 0 failures
45s: 144 runs so far, 0 failures
50s: 160 runs so far, 0 failures
55s: 180 runs so far, 0 failures
1m0s: 208 runs so far, 0 failures
1m5s: 224 runs so far, 0 failures
1m10s: 240 runs so far, 0 failures
1m15s: 256 runs so far, 0 failures
1m20s: 272 runs so far, 0 failures
1m25s: 288 runs so far, 0 failures
1m30s: 304 runs so far, 0 failures
1m35s: 320 runs so far, 0 failures
1m40s: 336 runs so far, 0 failures
1m45s: 356 runs so far, 0 failures
1m50s: 384 runs so far, 0 failures
1m55s: 400 runs so far, 0 failures
2m0s: 416 runs so far, 0 failures
2m5s: 432 runs so far, 0 failures
2m10s: 448 runs so far, 0 failures
2m15s: 464 runs so far, 0 failures
2m20s: 480 runs so far, 0 failures
2m25s: 496 runs so far, 0 failures
2m30s: 512 runs so far, 0 failures
2m35s: 532 runs so far, 0 failures
2m40s: 560 runs so far, 0 failures
2m45s: 576 runs so far, 0 failures
2m50s: 592 runs so far, 0 failures
2m55s: 608 runs so far, 0 failures
3m0s: 624 runs so far, 0 failures

Fixes #31313

/assign @alvaroaleman
as the original author of this part of the codebase

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: MadhavJivrajani
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[MadhavJivrajani]

@stevekuznetsov / @petr-muller could you also help take a look?

[MadhavJivrajani]

/hold
Getting back to the above failure in a bit ^

[k8s-ci-robot]

@MadhavJivrajani: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-test-infra-unit-test	3898c4f	link	true	/test pull-test-infra-unit-test
pull-test-infra-unit-test-race-detector-nonblocking	3898c4f	link	false	/test pull-test-infra-unit-test-race-detector-nonblocking

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

PR needs rebase.

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