fix: do not even send heatmap with no x or y

[pauldambra]

#1620 reminds us that JS can and will let people do whatever they want so we can't be guaranteed that events that trigger event listeners are really valid events

this filters out any event that doesn't have the clientX and clientY that we rely on

we safely filter these in ingestion, but we may as well just not send them

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Dec 19, 2024 1:14pm

[github-actions]

Size Change: +1.01 kB (+0.03%)

Total Size: 3.22 MB

Filename	Size	Change
dist/array.full.es5.js	262 kB	+103 B (+0.04%)
dist/array.full.js	365 kB	+103 B (+0.03%)
dist/array.full.no-external.js	364 kB	+103 B (+0.03%)
dist/array.js	179 kB	+100 B (+0.06%)
dist/array.no-external.js	178 kB	+100 B (+0.06%)
dist/main.js	180 kB	+100 B (+0.06%)
dist/module.full.js	365 kB	+103 B (+0.03%)
dist/module.full.no-external.js	364 kB	+103 B (+0.03%)
dist/module.js	179 kB	+100 B (+0.06%)
dist/module.no-external.js	178 kB	+100 B (+0.06%)

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	206 kB
dist/customizations.full.js	12.6 kB
dist/dead-clicks-autocapture.js	14.4 kB
dist/exception-autocapture.js	9.48 kB
dist/external-scripts-loader.js	2.48 kB
dist/recorder-v2.js	115 kB
dist/recorder.js	115 kB
dist/surveys-preview.js	57.6 kB
dist/surveys.js	63.3 kB
dist/tracing-headers.js	1.76 kB
dist/web-vitals.js	10.4 kB

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