fix(browser): Fix ElementTiming span timestamps and attribute names

[Lms24]

To do:

• settle on span time semantics
• agree on attributes and add them to conventions
• adjust tests

closes #19260

[github-actions]

Codecov Results 📊

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Generated by Codecov Action

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	25.56 kB	-	-
@sentry/browser - with treeshaking flags	24.08 kB	-	-
@sentry/browser (incl. Tracing)	42.38 kB	+0.05%	+17 B 🔺
@sentry/browser (incl. Tracing, Profiling)	47.05 kB	+0.05%	+21 B 🔺
@sentry/browser (incl. Tracing, Replay)	81.2 kB	+0.03%	+19 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	70.81 kB	+0.03%	+17 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	85.89 kB	+0.03%	+20 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	98.05 kB	+0.03%	+20 B 🔺
@sentry/browser (incl. Feedback)	42.29 kB	-	-
@sentry/browser (incl. sendFeedback)	30.23 kB	-	-
@sentry/browser (incl. FeedbackAsync)	35.22 kB	-	-
@sentry/browser (incl. Metrics)	26.74 kB	-	-
@sentry/browser (incl. Logs)	26.88 kB	-	-
@sentry/browser (incl. Metrics & Logs)	27.56 kB	-	-
@sentry/react	27.33 kB	-	-
@sentry/react (incl. Tracing)	44.72 kB	+0.05%	+20 B 🔺
@sentry/vue	30.01 kB	-	-
@sentry/vue (incl. Tracing)	44.23 kB	+0.05%	+21 B 🔺
@sentry/svelte	25.58 kB	-	-
CDN Bundle	28.11 kB	-	-
CDN Bundle (incl. Tracing)	43.21 kB	+0.03%	+12 B 🔺
CDN Bundle (incl. Logs, Metrics)	28.95 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	44.05 kB	+0.05%	+22 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	68.02 kB	-	-
CDN Bundle (incl. Tracing, Replay)	80.09 kB	+0.02%	+16 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	80.96 kB	+0.02%	+16 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	85.53 kB	+0.04%	+26 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	86.41 kB	+0.02%	+15 B 🔺
CDN Bundle - uncompressed	82.22 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	127.97 kB	+0.04%	+44 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	85.05 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	130.8 kB	+0.04%	+44 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	208.71 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	244.85 kB	+0.02%	+44 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	247.67 kB	+0.02%	+44 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	257.65 kB	+0.02%	+44 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	260.46 kB	+0.02%	+44 B 🔺
@sentry/nextjs (client)	47.06 kB	+0.05%	+22 B 🔺
@sentry/sveltekit (client)	42.84 kB	+0.06%	+24 B 🔺
@sentry/node-core	52.17 kB	-	-
@sentry/node	166.53 kB	-	-
@sentry/node - without tracing	93.96 kB	-	-
@sentry/aws-serverless	109.47 kB	-	-

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