feat(explore): Add support for count_unique in eap

[Zylphrex]

This adds support for the count_unique aggregate in eap enabled views.

Closes EXP-7

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
10236	1	10235	5

View the top 1 failed test(s) by shortest run time

WidgetBuilder spans dataset timeseries returns group by and aggregate as primary options

Stack Traces | 1.47s run time

Error: expect(received).toHaveLength(expected)

Expected length: 12
Received length: 13
Received array:  [<p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7ko»">count(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7kr»">count_unique(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7ku»">avg(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7l1»">p50(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7l4»">p75(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7l7»">p90(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7la»">p95(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7ld»">p99(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7lg»">p100(…)</p>, <p class="e1b0h4f90 css-17bnw9v-Label-overflowEllipsis-withChonk e6ii5yr2" data-test-id="menu-list-item-label" id="«r7lj»">sum(…)</p>, …]
    at Object.<anonymous> (.../dashboards/widgetBuilder/widgetBuilderSortBy.spec.tsx:833:84)

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[narsaynorath]

Really small comments, but tested it out locally and looks good to me

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TestingLibraryElementError: Unable to find an accessible element with the role "button" and name "count" Object.?(content.spec.tsx) View Issue
• ‼️ Error: �[2mexpect(�[22m�[31mreceived�[39m�[2m).�[22mtoEqual�[2m(�[22m�[32mexpected�[39m�[2m) // deep equality�[22m Object.?(content.spec.tsx) View Issue

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