Gene Specific Chart Comparison Page frontend

[i-am-leslie]

Fix cBioPortal/cbioportal#11771

Describe changes proposed in this pull request:
This pull request introduces frontend updates to support accurate comparison for gene-specific mutation charts and enables a comparison button for gene-specific charts

• The frontend now sends a request to the backend API (/mutation-data-counts/fetch) to retrieve sample IDs for all groups in a mutation-specific chart.
• The backend endpoint has been extended to return additional data, allowing the frontend to correctly separate samples into their respective groups for comparison.
• Previously, the comparison button was disabled when only a single group was present in the chart, as comparison is not meaningful in that case, With this change, when a chart contains more than one group, the comparison button is enabled, and sample IDs can be grouped by their associated clinical attributes to support comparison.
• The comparison button remains disabled when only one group is available, preserving the intended behavior.

Checks

• A test was written for the utility class functions that group samples into their respective mutation status
• Yes, the commit log is comprehensive.
• No, it is not adding logic based on one or more clinical attributes

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[alisman]

@i-am-leslie this stretch of code is pretty hairy. see if you can use some of the lodash helpers groupBy, keyBy etc. to simplify this. in particular look for ways to use assignment instead of declaration and addition. i.e. var result = _.groupBy(...)

[alisman]

there are sometimes edge cases where it won't work, but should look. and i must say, that this is where AI really shines. just ask it for suggestsions about how to simplify long stretches of code. it will also add nice comments that help a reader.