test(mocks): move mocks to shared folder (closes #16192)

[thmsobrmlr]

Problem

This is a rework of #16192 on top of current master (was easier than resolving the merge conflicts).

The issue mentioned in the previous review with bold number popping up as NaN in the visual regression test doesn't occur any more, since the test was removed in #16108 (comment).

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Jest has been complaining about duplicate manual mocks like the following. Additionally we're re-creating these mocks in multiple places throughout the app.

jest-haste-map: duplicate manual mock found: lifecycle
  The following files share their name; please delete one of them:
    * <rootDir>/scenes/insights/__mocks__/lifecycle.json
    * <rootDir>/lib/components/Cards/InsightCard/__mocks__/lifecycle.json

Changes

This PR moves the mocks to a central folder for re-use between different tests. It would be nice to even auto generate those and associated mock dates.

How did you test this code?

CI run

[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

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

Triggered by this commit.

👉 Review this PR's diff of snapshots.

[Twixes]

Looks good except still a NaN here

[thmsobrmlr]

Whoops.. fixed it for real now. Problem was that the insight short_id was reused across the insights in the cards. They have unique short_ids now.

[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

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

Triggered by this commit.

👉 Review this PR's diff of snapshots.

[Twixes]

Looks good now