[9.0] [A11y][APM] Add aria-label to popover service in service overview (#215640) (#215696)

# Backport

This will backport the following commits from `main` to `9.0`:
- [[A11y][APM] Add `aria-label` to popover service in service overview
(#215640)](https://github.com/elastic/kibana/pull/215640)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Sergi
Romeu","email":"sergi.romeu@elastic.co"},"sourceCommit":{"committedDate":"2025-03-24T12:54:30Z","message":"[A11y][APM]
Add `aria-label` to popover service in service overview (#215640)\n\n##
Summary\n\nFixes #210258\n\nThis PR adds an `aria-label` with the same
content as the title to solve\nthe \"Button must have a discernible
text\" A11y critical issue.\n\n## How to test\n1. Download the
[axe\ndevtools](https://chromewebstore.google.com/detail/axe-devtools-web-accessib/lhdoppojpmngadmnindnejefpokejbdd)\n2.
Go into a service overview and run the scanner from axe devtools\n3. You
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Add `aria-label` to popover service in service
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Add `aria-label` to popover service in service overview (#215640)\n\n##
Summary\n\nFixes #210258\n\nThis PR adds an `aria-label` with the same
content as the title to solve\nthe \"Button must have a discernible
text\" A11y critical issue.\n\n## How to test\n1. Download the
[axe\ndevtools](https://chromewebstore.google.com/detail/axe-devtools-web-accessib/lhdoppojpmngadmnindnejefpokejbdd)\n2.
Go into a service overview and run the scanner from axe devtools\n3. You
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Add `aria-label` to popover service in service overview (#215640)\n\n##
Summary\n\nFixes #210258\n\nThis PR adds an `aria-label` with the same
content as the title to solve\nthe \"Button must have a discernible
text\" A11y critical issue.\n\n## How to test\n1. Download the
[axe\ndevtools](https://chromewebstore.google.com/detail/axe-devtools-web-accessib/lhdoppojpmngadmnindnejefpokejbdd)\n2.
Go into a service overview and run the scanner from axe devtools\n3. You
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BACKPORT-->

Co-authored-by: Sergi Romeu <sergi.romeu@elastic.co>

x-pack/solutions/observability/plugins/apm/public/components/shared/service_icons/icon_popover.tsx

@@ -43,6 +43,7 @@ export function IconPopover({
           color="text"
           onClick={onClick}
           iconType={icon.type}
+          aria-label={title}
           iconSize={icon.size ?? 'l'}
           className="serviceIcon_button"
           data-test-subj={`popover_${title}`}