feat(web-analytics): Rename initial session properties from "Initial X" to "Session X"

[robbie-c]

Problem

Spot the difference (one is using person props, the other session pros)

Internal thread: https://posthog.slack.com/archives/C06R39WNY5B/p1714475094508139?thread_ts=1714474192.508889&cid=C06R39WNY5B

Changes

Make the session props look like "Session UTM source".

I also considered changing the icon for person/session/etc props, but not everywhere where this text is used has an icon

Does this work well for both Cloud and self-hosted?

Yes

How did you test this code?

Screenshot:

[github-actions[bot]]

Size Change: +74 B (0%)

Total Size: 1.05 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.05 MB	+74 B (0%)

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📸 UI snapshots have been updated

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• chromium: 0 added, 2 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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