Rename tidb_enable_concurrent_hashagg_spill to tidb_enable_parallel_hashagg_spill

[xzhangxian1008]

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What is the related PR or file link(s)?

• This PR is translated from: Rename tidb_enable_concurrent_hashagg_spill to tidb_enable_parallel_hashagg_spill docs-cn#17700
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[xzhangxian1008]

/cc @Oreoxmt

[xzhangxian1008]

/label needs-cherry-pick-release-8.1

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-17 06:20:50.837712276 +0000 UTC m=+9377.323201119: ☑️ agreed by Oreoxmt.
• 2024-06-17 06:25:48.013231474 +0000 UTC m=+9674.498720298: ☑️ agreed by qiancai.

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[Oreoxmt]

/approve

[ti-chi-bot]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.0: #17908.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #17909.