Docs: Delete table of SAST scanner output fields

What does this MR do?

Remove a table that documents which fields are outputted by the upstream scanners used in different analyzers. This is for a few reasons:

• Most of the analyzers in the table have reached End of Support.
• I don't believe this information is useful to a customer.
• The table is wide enough that it breaks the page layout at most reasonable screen sizes.
• The table does not appear maintained and includes some incorrect info; for example, the "⚠" cautions around Semgrep severities are incorrect and the Confidence field has not been in the SAST report format for a few years.

I'm hoping to simplify these pages, in part due to the attached OKR.

Related issues

https://gitlab.com/gitlab-com/gitlab-OKRs/-/issues/8023

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