Disco cnv UI updates

[creilly8]

Description

Closes issue #2555.

Minor changes:

1. Removed cnv capping as a legend item
2. The Unit row in the cnv tooltip is removed as the value is already present in the first row.

Test:

1. GDC example
2. PNET example

Checklist

Check each task that has been performed or verified to be not applicable.

• Tests: added and/or passed unit and integration tests, or N/A
• Todos: commented or documented, or N/A
• Notable Changes: updated release.txt, prefixed a commit message with "fix:" or "feat:", added to an internal tracking document, or N/A

[xzhou82]

thanks, please also improve the gene hover tooltip. e.g. here and hover over PIK3CA

the tooltip should show following rows

1. Gene: PIK3CA (remove the extra padding on left of gene name)
2. Mutation: aachange consequence(in color) chr:pos
3. Mutation: if gene has multiple mutations
4. CNV: [colorbox] value chr:start-stop

no change to tooltip hovering on a mutation

[creilly8]

thanks, please also improve the gene hover tooltip. e.g. here and hover over PIK3CA

the tooltip should show following rows

1. Gene: PIK3CA (remove the extra padding on left of gene name)
2. Mutation: aachange consequence(in color) chr:pos
3. Mutation: if gene has multiple mutations
4. CNV: [colorbox] value chr:start-stop

no change to tooltip hovering on a mutation

@xzhou82. I don't quite understand. #1 and #4 were easy to fix but I don't know what you mean in #2 or #3. Do you want the Consequence row updated to Mutation? Are you also asking for all mutations to be listed in one row instead of individually?