refactor: rename motd to tips

[paul-soporan]

What's the problem this PR addresses?

After some discussions, we've agreed on changing motd to tips, as the motd acronym (message of the day) might not be widespread enough.

How did you fix it?

This PR changes:

• enableMotd to enableTips
• the MOTD_NOTICE message name to TIPS_NOTICE
• motd.json to tips.json (CC @arcanis since you need to change the cloudflare worker)
• TelemetryManager#isMotd to TelemetryManager#shouldShowTips as it's more descriptive and also more consistent with the existing shouldCommitTips

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.