non-jdbc source connectors: Remove additional properties from beta/GA specs and schemas

[alafanechere]

What

Before merging #14878 I fix beta and GA connectors whose acceptance tests might fail after adding this new rule:

• Connectors must not use additionalProperties set to anything else than true in their JSON spec and stream schemas.

How

• Edit spec.json and schemas of the following connectors:

source_name	status
source-amplitude	generally_available
source-stripe	generally_available
source-intercom	generally_available
source-linkedin-ads	generally_available
source-google-search-console	beta
source-notion	beta
source-snapchat-marketing	beta
source-mixpanel	beta

[pedroslopez]

🎉Connectors Build was failing on the latest commit, but I re-ran it and seems fine now

[alafanechere]

/publish connector=connectors/source-amplitude,connectors/source-stripe,connectors/source-intercom,connectors/source-linkedin-ads,connectors/source-google-search-console,connectors/source-notion,connectors/source-snapchat-marketing,connectors/source-mixpanel

🕑 Publishing the following connectors:
connectors/source-amplitude,connectors/source-stripe,connectors/source-intercom,connectors/source-linkedin-ads,connectors/source-google-search-console,connectors/source-notion,connectors/source-snapchat-marketing,connectors/source-mixpanel
https://github.com/airbytehq/airbyte/actions/runs/2717206083

Connector	Did it publish?	Were definitions generated?
connectors/source-intercom	✅	✅
connectors/source-amplitude	✅	✅
connectors/source-stripe	✅	✅
connectors/source-linkedin-ads	✅	✅
connectors/source-google-search-console	✅	✅
connectors/source-notion	✅	✅
connectors/source-snapchat-marketing	✅	✅
connectors/source-mixpanel	✅	✅

if you have connectors that successfully published but failed definition generation, follow step 4 here ▶️