Fix a11y issue with dev tool tabs (#149349)

Fixes #148538

## Summary

This PR fixes the a11y issue with the Beta badge used in the Dev Tools
tabs.

The proposed solution in the GH issue (moving `EuiBetaBadge` outside of
the `EuiTab` component) didn't work well as it introduced another a11y
issue - `EuiTabs` would contain an `EuiBetaBadge` component which is not
its direct child (it needs to wrap `EuiTab` components only). Also, this
solution caused some styling issues.

Removing the `tooltipContent` prop from `EuiBetaBadge` resolves the a11y
issue without introducing other a11y issues. Also, the `Beta` text is
still announced by screen readers as part of the `Painless Lab` tab
(tested on Mac's VoiceOver and the Screen Reader Chrome extension) and
the design is not changed.

<img width="1828" alt="Screenshot 2023-01-23 at 16 17 55"
src="https://user-images.githubusercontent.com/59341489/214102739-bf0783e3-755a-474d-8978-17fb4b7d0fbd.png">



### Checklist

- [X] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [X] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [X] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))

src/plugins/dev_tools/public/application.tsx

@@ -108,9 +108,6 @@ function DevToolsWrapper({
                     label={i18n.translate('devTools.badge.betaLabel', {
                       defaultMessage: 'Beta',
                     })}
-                    tooltipContent={i18n.translate('devTools.badge.betaTooltipText', {
-                      defaultMessage: 'This feature might change drastically in future releases',
-                    })}
                   />
                 )}
               </span>

x-pack/plugins/translations/translations/fr-FR.json

@@ -36206,7 +36206,6 @@
     "cases.components.status.inProgress": "En cours",
     "cases.components.status.open": "Ouvrir",
     "devTools.badge.betaLabel": "Bêta",
-    "devTools.badge.betaTooltipText": "Cette fonctionnalité pourra considérablement changer dans les futures versions",
     "devTools.badge.readOnly.text": "Lecture seule",
     "devTools.badge.readOnly.tooltip": "Enregistrement impossible",
     "devTools.breadcrumb.homeLabel": "Outils de développement",

x-pack/plugins/translations/translations/ja-JP.json

@@ -36175,7 +36175,6 @@
     "cases.components.status.inProgress": "進行中",
     "cases.components.status.open": "開く",
     "devTools.badge.betaLabel": "ベータ",
-    "devTools.badge.betaTooltipText": "この機能は将来のリリースで大幅に変更される可能性があります",
     "devTools.badge.readOnly.text": "読み取り専用",
     "devTools.badge.readOnly.tooltip": "を保存できませんでした",
     "devTools.breadcrumb.homeLabel": "開発ツール",

x-pack/plugins/translations/translations/zh-CN.json

@@ -36211,7 +36211,6 @@
     "cases.components.status.inProgress": "进行中",
     "cases.components.status.open": "打开",
     "devTools.badge.betaLabel": "公测版",
-    "devTools.badge.betaTooltipText": "此功能在未来的版本中可能会变化很大",
     "devTools.badge.readOnly.text": "只读",
     "devTools.badge.readOnly.tooltip": "无法保存",
     "devTools.breadcrumb.homeLabel": "开发工具",