Boost: Add tracks events

[haqadn]

Fixes Automattic/boost-cloud#493

Proposed changes:

• Added identifiers for contextual triggers
• Added tracks event for performance history CTA

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

No

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• Click upgrade CTA on performance history panel
• See if jetpack_boost_performance_history_upgrade_cta_click got recorded.
• Click the contextual triggers under, Critical CSS, Image CDN, Image Guide.
• Make sure jetpack_boost_upsell_cta_from_settings_page_in_plugin events are recorded with an identifier prop.

[github-actions]

Thank you for your PR!

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Boost plugin:

• Next scheduled release: August 6, 2024.
• Scheduled code freeze: July 29, 2024.

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[pyronaur]

LGTM