fix(dual-axes): 双轴图的 y 字段相同的时候,导致 yaxis 配置被覆盖

[hustcc]

PR includes

• add / modify test cases

Screenshot

Before	After
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[lgtm-com]

This pull request introduces 1 alert when merging f42f2e9 into e4da1f9 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[github-actions]

😭 Deploy PR Preview eb14f5b failed. Build logs

_{🤖 By surge-preview}

[coveralls]

Pull Request Test Coverage Report for Build 463126442

• 14 of 14 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 96.814%

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Totals
Change from base Build 462758914:	0.02%
Covered Lines:	4483
Relevant Lines:	4521

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💛 - Coveralls

[lgtm-com]

This pull request introduces 1 alert when merging a42971e into e4da1f9 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 1 alert when merging eb14f5b into e4da1f9 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class