[indexer-alt-framework] Improve test coverage for reader_watermark

[tpham-mysten]

Description

Improve test coverage for concurrent/reader_watermark.rs

Test coverage includes:

• Basic watermark update
• Watermark no update with smaller reader_lo
• DB connection failure
• DB set_reader_watermark falure

Test plan

How did you test the new or updated feature?

cargo test -p sui-indexer-alt-framework  reader_watermark  --lib

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Release notes

Check each box that your changes affect. If none of the boxes relate to your changes, release notes aren't required.

For each box you select, include information after the relevant heading that describes the impact of your changes that a user might notice and any actions they must take to implement updates.

• Protocol:
• Nodes (Validators and Full nodes):
• gRPC:
• JSON-RPC:
• GraphQL:
• CLI:
• Rust SDK:

Stack

• [indexer-alt-framework] Improve test coverage for collector.rs #22359
• [indexer-alt-framework] Improve test coverage for pruner.rs #22366
• [indexer-alt-framework] Improve test coverage for processor.rs #22393
• [indexer-alt-framework] Improve test coverage for concurrent/committer #22397

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