[cherry-pick] controller: fix the low_ru request missed

[nolouch]

What problem does this PR solve?

Issue Number: Close #8349

What is changed and how does it work?

controller: fix the low_ru request missed 

The problem is that `c.run.currentRequests` is shared by all groups.
If one group triggers a token request that isn't handled by the response, the other group's requests will be discarded.
Here, we do not discard the low_ru triggers.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Release note

None.

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This pull-request has been approved by: HuSharp

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-05 10:27:58.168487389 +0000 UTC m=+7775.403721501: ☑️ agreed by HuSharp.