chore(tikv): set retry to 5 on new ut on lts branch

[purelind]

set retry to 5 on new ut on lts branch.

[ti-chi-bot[bot]]

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[ti-chi-bot[bot]]

I have already done a preliminary review for you, and I hope to help you do a better job.

Based on the pull request diff, it seems that the change only adds the --retries 5 argument to the EXTRA_NEXTEST_ARGS variable in the pull_unit_test.groovy file for three different release branches (release-6.5, release-7.1, and release-7.5) of the tikv repository.

There are no potential problems that I can see with this change. However, it would be good to make sure that the --retries option is supported by the testing framework being used.

As for fixing suggestions, it would be good to add some more context to the pull request description to explain why the retries are being added. Additionally, it might be helpful to add some comments in the code explaining the purpose of the --retries option and how it affects the testing process.