[7.x] Discover: Add handling for source column (#91815), enable fields by default, Fix context view for date_nanos format with custom timestamps (#54089)

[flash1293]

Backports the following commits to 7.x:

• Discover: Add handling for source column (Discover: Add handling for source column #91815)
• Enabled fields by default
• Fix context view for date_nanos format with custom timestamps ([Discover] Fix context view for date_nanos format with custom timestamps #54089)

[flash1293]

This PR failed because fields API isn't default yet on 7.x - I'm going to change that on a separate PR, then update this one

[kibanamachine]

💔 Build Failed

• continuous-integration/kibana-ci/pull-request
• Commit: 6c7ae3b
• Storybooks Preview
• Pipeline Steps (look for red circles / failed steps)
• Interpreting CI Failures

Failed CI Steps

• Check TypeScript Projects
• Execute oss-firefox

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
discover	348	349	+1

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
discover	408.7KB	409.5KB	+745.0B

History

• 💛 Build #108003 was flaky 6c7ae3b
• 💔 Build #107923 failed 81aadb1

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