Fix call to undefined method WC_Tracks::get_server_details()

[chihsuan]

Fixes p1759758124573359/1759158780.923629-slack-CK365S85V

Proposed changes:

Implement conditional checks for get_server_details and get_blog_details methods to support WC_Site_Tracking for versions below 6.8.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

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

Testing instructions:

• Use WC 6.8 or moved get_blog_details and get_session_details methods from ‎woocommerce/includes/tracks/class-wc-tracks.php‎ to ‎woocommerce/includes/tracks/class-wc-site-tracking.php‎
• Go to your site frontend and check that no errors are thrown.

[github-actions]

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bin/jetpack-downloader test jetpack fix/wc-analytics-undefined-methods

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[github-actions]

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[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/woocommerce-analytics/src/class-wc-analytics-tracking.php	0/150 (0.00%)	0.00%	9 💔

Full summary · PHP report · JS report

_{If appropriate, add one of these labels to override the failing coverage check: Covered by non-unit tests Use to ignore the Code coverage requirement check when E2Es or other non-unit tests cover the code Coverage tests to be added later Use to ignore the Code coverage requirement check when tests will be added in a follow-up PR I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage.}