chore(Tracking): Remove the unused Capterra conversion pixel

[Holmus]

Thanks for submitting a PR! Please check the boxes below:

• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature. (Not required: the setting isn't documented.)
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

The Capterra conversion pixel fired when an organisation was created, and it was added to the page as a visible image. Browsers that block trackers showed it as broken-image icons under the page. Capterra tracking isn't used any more.

• Remove the pixel from both organisation-creation forms.
• Remove the image helper that only the pixel used, and the capterraKey project setting.

After merging, the CAPTERRA_API_KEY environment variable can be removed wherever it's set.

Review effort: 1/5

How did you test this code?

• Locally: CI=true lint on changed lines and the full unit test suite pass. Type errors are unchanged from main.
• Create an organisation (from the organisation modal and from /create) with a tracker blocker on, and confirm no broken images appear.

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Project	Deployment	Actions	Updated
flagsmith-frontend-preview	Building	Preview	Oct 9, 2026 3:16pm UTC
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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Ignored		Oct 9, 2026 3:16pm UTC

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