refactor(meta): extract common method to inject initial barrier

[wenym1]

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What's changed and what's your intention?

As titled.

Previously, in method recovery_inner of global barrier worker, we have code that take and rebuild runtime information of each database and inject the initial barriers. In this PR, we extract the code to be a separate methods, so that we can reuse the similar logic when support database failure isolation.

We also introduce an optimization in this PR. Previously during recovery, we will inject and wait collect initial barrier for each database one by one, and actually the work can be done concurrently. In this PR, we change to inject the initial barriers to all databases all at once, and then wait for collecting the initial barriers from all databases.

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[wenym1]

• feat(barrier): support database failure isolation (part 2, local) #19579
• refactor(meta): extract common method to inject initial barrier #19622 👈 (View in Graphite)
• main

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[wenym1]

The deleted code is mostly moved to the inject_database_initial_barrier in src/meta/src/barrier/rpc.rs with only changing some variable names.