[fix](test) replace hardcoded IP with variable in group commit redirect test

[liaoxin01]

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

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• Test

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• Behavior changed:

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[Thearas]

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[liaoxin01]

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[Copilot]

Pull request overview

This PR fixes hardcoded IP addresses in the group commit redirect test by replacing them with the dynamic feIp variable. The test validates redirect behavior when enable_group_commit_streamload_be_forward is enabled, checking that the default (empty) redirect policy correctly routes to the FE's actual IP address rather than a hardcoded test IP.

Changes:

• Replaced hardcoded IP 11.20.20.19 with $feIp variable in default redirect policy assertions
• Ensures test works correctly in dynamic/containerized environments where IPs are not fixed

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PR approved by at least one committer and no changes requested.

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