SAST Config UI telemetry

What does this MR do?

This change allows us to track when the SAST UI Config form is submitted, as well as whether it was a create or an update for the .gitlab-ci.yml file, as well as whether default values were changed.

As per the Preparing your MR for Review section of the documentation, here is sample output of the Snowplow Micro good events:

"se_ac":"update" indicates that the .gitlab-ci.yml is being updated and "se_la":"true" indicates that default values were overridden.

[{"event":{"api":{"vendor":"com.snowplowanalytics.snowplow","version":"tp1"},"parameters":{"e":"se","eid":"63c4b8c3-1bb8-4bbf-a89a-f124d0c91e89","tna":"gl","stm":"1600442830148","tv":"rb-0.6.1","se_ac":"update","se_la":"true","se_ca":"Security::CiConfiguration::SastCreateService","p":"srv","dtm":"1600442830146"},"contentType":null,"source":{"name":"ssc-0.15.0-stdout$","encoding":"UTF-8","hostname":"localhost"},"context":{"timestamp":"2020-09-18T15:27:10.180Z","ipAddress":"172.17.0.1","useragent":"Ruby","refererUri":null,"headers":["Accept-Encoding: gzip, deflate;q=0.6, identity;q=0.3","Accept: */*","User-Agent: Ruby","Connection: close","Host: localhost:9090","Timeout-Access: <function1>"],"userId":"c29a8f36-4b5a-465c-b271-9e6791666798"}},"eventType":"se","schema":null,"contexts":null}]

"se_ac":"update" indicates that the .gitlab-ci.yml is being updated and "se_la":"false" indicates that default values were not overridden.

[{"event":{"api":{"vendor":"com.snowplowanalytics.snowplow","version":"tp1"},"parameters":{"e":"se","eid":"0b67d2c0-477a-4a46-8adc-a65247d475b2","tna":"gl","stm":"1600442781542","tv":"rb-0.6.1","se_ac":"update","se_la":"false","se_ca":"Security::CiConfiguration::SastCreateService","p":"srv","dtm":"1600442781540"},"contentType":null,"source":{"name":"ssc-0.15.0-stdout$","encoding":"UTF-8","hostname":"localhost"},"context":{"timestamp":"2020-09-18T15:26:21.586Z","ipAddress":"172.17.0.1","useragent":"Ruby","refererUri":null,"headers":["Accept-Encoding: gzip, deflate;q=0.6, identity;q=0.3","Accept: */*","User-Agent: Ruby","Connection: close","Host: localhost:9090","Timeout-Access: <function1>"],"userId":"ca8e5f34-f92d-48c8-9a90-fbafa6e42a41"}},"eventType":"se","schema":null,"contexts":null}]

Issue: #235600 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team