chore: update tidb-dashboard to v2023.08.15.1 (#6967)

[ti-chi-bot]

This is an automated cherry-pick of #6967

What problem does this PR solve?

Issue Number: Close #6966

What is changed and how does it work?

1. This PR fixed the statements list export failed issue
2. This PR support config the ngm component timeout param

Release note

None.

Test

make pd-server
tiup playground v6.5.3 --tiflash 0 --pd.binpath /mnt/bao/codes/work/pd/bin/pd-server

[ti-chi-bot]

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[baurine]

This PR can be replaced by PR #7084 , so it can be closed, please help close it, thanks~