fix: lock label moveoverlap in grid

[linlang171]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

When using the moveOverLap attribute for label overlap, the position should remain within the coordinate system.

Fixed issues

#21461

Details

Before: What was the problem?

1、When using the moveOverLap attribute for label overlap，in some cases, offsets are applied unnecessarily.

2、When using the moveOverLap attribute for label overlap，the position don't remain within the coordinate system

After: How does it behave after the fixing?

Offset should only occur when necessary and should not be moved out of the coordinate system it is in

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

Security Checking

• This PR uses security-sensitive Web APIs.

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

N.A.

Merging options

• Please squash the commits into a single one when merging.

Other information

[echarts-bot]

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