[9.0] [chore][serverless] Remove dev-mode Project Switcher (#209144)

[kibanamachine]

Backport

This will backport the following commits from main to 9.0:

• [chore][serverless] Remove dev-mode Project Switcher (#209144)

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: e14183e
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Failed CI Steps

• FTR Configs #36

Test Failures

• [job] [logs] FTR Configs #36 / Space awareness change space agent policies PUT /agent_policies/{id} should allow set policy in multiple space

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
serverless	67	56	-11

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/serverless-project-switcher	7	-	-7

Async chunks

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

id	before	after	diff
serverless	27.5KB	27.5KB	+34.0B

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
@kbn/serverless-project-switcher	1	-	-1
@kbn/serverless-types	1	0	-1
total			-2

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
serverless	12.1KB	9.1KB	-3.0KB

Unknown metric groups

API count

id	before	after	diff
@kbn/serverless-project-switcher	10	-	-10
serverless	25	24	-1
total			-11

cc @clintandrewhall