Remove SAST_DEFAULT_ANALYZERS documentation

As part of https://gitlab.com/gitlab-org/gitlab/-/issues/290777, this MR
removes documentation for the SAST_DEFAULT_ANALYZERS variable

doc/user/application_security/sast/analyzers.md

@@ -80,27 +80,6 @@ variables:
 This configuration requires that your custom registry provides images for all
 the official analyzers.
 
-### Selecting specific analyzers
-
-WARNING:
-`SAST_DEFAULT_ANALYZERS` is [deprecated](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/50872) in GitLab 13.8,
-and is scheduled for [removal in GitLab 14.0](https://gitlab.com/gitlab-org/gitlab/-/issues/290777).
-
-You can select the official analyzers you want to run. Here's how to enable
-`bandit` and `flawfinder` while disabling all the other default ones.
-In `.gitlab-ci.yml` define:
-
-```yaml
-include:
-  - template: Security/SAST.gitlab-ci.yml
-
-variables:
-  SAST_DEFAULT_ANALYZERS: "bandit,flawfinder"
-```
-
-`bandit` runs first. When merging the reports, SAST
-removes the duplicates and keeps the `bandit` entries.
-
 ### Disabling all default analyzers
 
 Setting `SAST_DISABLED` to `true` disables all the official

doc/user/application_security/sast/index.md

@@ -455,7 +455,6 @@ The following are Docker image-related CI/CD variables.
 |---------------------------|---------------------------------------------------------------------------------------------------------------------------------------|
 | `SECURE_ANALYZERS_PREFIX` | Override the name of the Docker registry providing the default images (proxy). Read more about [customizing analyzers](analyzers.md). |
 | `SAST_ANALYZER_IMAGE_TAG` | **DEPRECATED:** Override the Docker tag of the default images. Read more about [customizing analyzers](analyzers.md).                 |
-| `SAST_DEFAULT_ANALYZERS`  | **DEPRECATED:** Override the names of default images. Scheduled for [removal in GitLab 14.0](https://gitlab.com/gitlab-org/gitlab/-/issues/290777). |
 | `SAST_EXCLUDED_ANALYZERS` | Names of default images that should never run. Read more about [customizing analyzers](analyzers.md).                                 |
 
 #### Vulnerability filters