fix(custom): fix series label on custom series not working properly. close #14092

[Nick22nd]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

fix the color of series label on custom series not following the color of bars

Fixed issues

• Series Label on Custom Series not working properly #14092: Series Label on Custom Series not working properly

Details

Before: What was the problem?

The color of series label on custom series followed the last/hovered bar.

After: How is it fixed in this PR?

I read the comment below and code on v4.9.0 branch. But I'm not sure whether the fix meets requirement of comment below:

Element.ts

 outsideFill is a color string or left empty.
If a textContent is "inside", its final fill will be picked by this priority:
textContent.style.fill > textConfig.outsideFill > #000

txCfg.outsideFill always get 'auto' as default value , the color of series label should follow the color of bars.

Usage

Are there any API changes?

• The API has been changed.

Related test cases or examples to use the new APIs

NA.

Others

Merging options

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

Other information

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