zh,en: remove spec.from for Backup and spec.to for Restore

[csuzhangxc]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added, or deleted? (Required)

remove spec.from for Backup using BR and spec.to for Restore using BR.

not remove these for Dumpling & Lightning

Which TiDB Operator version(s) do your changes apply to? (Required)

• master (the latest development version)
• v1.6 (TiDB Operator 1.6 versions)
• v1.5 (TiDB Operator 1.5 versions)
• v1.4 (TiDB Operator 1.4 versions)
• v1.3 (TiDB Operator 1.3 versions)
• v1.2 (TiDB Operator 1.2 versions)

for v1.4, I'll open another PR to comment these out (instead of remove them)

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

• This PR is translated from:
• Other reference link(s):

[ti-chi-bot]

@WangLe1321: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-27 05:08:40.573831639 +0000 UTC m=+846915.708281745: ☑️ agreed by Oreoxmt.

[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-1.6: #2616.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.5: #2617.