UI/UX improvements to usage telemetry page

[adrienthebo]

We've received feedback about the overall structure, voice, and layout of the self-hosted telemetry page (thanks @gtsiolis!) that'll communicate information more effectively and improve the overall user experience. We'd like to improve the following areas:

• Correlate Send Service Ping checkbox with Send Customer ID checkbox; unchecking the service ping setting should disable/grey out the send customer ID option.
• Changing telemetry settings updates the telemetry preview (at present a page refresh is required)
• Change telemetry preview in response to disabling telemetry (preview should be greyed out, indicating that it won't be sent)
• Page layout improvements: group link to privacy policy with section description, change heading for telemetry preview (to indicate that it's part of the Usage Statistics section
• Clarify wording telemetry usage, improve tone of messaging to communicate intent more effectively

[gtsiolis]

Thanks for opening this, @adrienthebo! Cross-linking also relevant discussion (internal) and relevant pull request for more context.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.