[Cherry-Pick][CI] Remove skip logic for *.txt-only changes(#7104)

[EmmonsCurse]

Cherry-pick of #7104 (authored by @EmmonsCurse) to release/2.4.

devPR:#7104

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Motivation

CI was skipped for *.txt-only changes, which caused updates to requirements.txt to be ignored and missed dependency validation.

Modifications

Remove the skip logic for *.txt-only changes to ensure dependency updates (e.g., requirements.txt) always trigger CI.

Usage or Command

N/A

Accuracy Tests

N/A

Checklist

• Add at least a tag in the PR title.
• Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
• You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[paddle-bot]

Thanks for your contribution!