disagg: Add metrics about disaggreated arch (#10631)

[ti-chi-bot]

This is an automated cherry-pick of #10631

What problem does this PR solve?

Issue Number: ref #10634

Problem Summary:

What is changed and how it works?

* Performance metrics
  * Metrics when tiflash-compute doing delta-index place, whether the delta-index are reuse or updated, the rows and deletes updated
  * Metrics when S3RandomAccessFile read/seek meet error
  * The number of active SegmentReadTask 
* Remote Object Storage summary
  * Add a http api "http://${TIFLASH_IP}:${TIFLASH_STATUS_PORT}/tiflash/remote/info" for fetching the object storage summary from tiflash-write node

New added panels

• "Storage Read Pool & Data Sharing", panels about read tasks

* "Disaggregated-Compute", panels about place index * "S3", panels about S3RandomeAccessFile

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

# Run chbenchmark on chbenchmark 8000
tiup bench ch --host 10.2.12.81 -P 8081 --warehouses 8000 run -D chbenchmark8k -T 50 -t 2 --time 60m --ignore-error --queries q1

• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

@JaySon-Huang This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

@ti-chi-bot: ## If you want to know how to resolve it, please read the guide in TiDB Dev Guide.

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[JaySon-Huang]

/unhold
conflict are resolved

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-12-29 03:01:30.315342564 +0000 UTC m=+2651635.129120136: ☑️ agreed by JinheLin.
• 2025-12-29 03:36:16.297284464 +0000 UTC m=+2653721.111062026: ☑️ agreed by CalvinNeo.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CalvinNeo, JinheLin, kolafish

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Needs approval from an approver in each of these files:

• OWNERS [CalvinNeo,JinheLin]

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[ti-chi-bot]

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