fix: stickiness cumulative doesn't sum to 100%

[aspicer]

Problem

Cumulative stickiness should always sum to 100%

Changes

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

Yes

How did you test this code?

Unit and test in dev

[greptile-apps]

PR Summary

This PR fixes an issue where cumulative stickiness calculations weren't summing to 100% by preserving the original count value before data transformation.

• Added assertion in posthog/hogql_queries/insights/test/test_stickiness_query_runner.py to verify the count field is correctly set to 3 in cumulative stickiness results
• Modified posthog/hogql_queries/insights/stickiness_query_runner.py to store the original count value before applying cumulative transformations
• The fix ensures accurate percentage calculations by using the total user count from original data rather than from transformed cumulative data
• Test validates the fix with three users having different activity patterns (p1: 3 days, p2: 2 days, p3: 1 day)

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