owner, gcutil: always update service GC safepoint when owner finds new changefeeds (#2512)

[ti-chi-bot]

This is an automated cherry-pick of #2512

What problem does this PR solve?

Extend creating service gc safepoint ttl to 1 hr to support creating changefeeds that needs long initialization time.
Also let TiCDC always update service GC safepoint when it finds a new changefeed, see https://github.com/pingcap/ticdc/pull/2512/files#diff-0e06be9eaec63633a515c0b4eafda0d674cfa49885009c96b1389c1f1002f22cR335

Close #2470

Check List

Tests

• Manual test (add detailed scripts or steps below)

Create a changefeed that captures 60k tables.

Related changes

• Need to cherry-pick to the release branch

Release note

Extend creating service gc safepoint ttl to 1 hr to support creating changefeeds that needs long initialization time.

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: PR needs rebase.

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