[Fleet] Fix broken add fleet server button on policies page flyout

[kpollich]

Summary

Fix "Add Fleet Server" button not doing anything when opening enrollment flyout during "Add Integration" flow.

Fixes #131706

Related follow-up tech debt issue: #131839

Screen Recording

Screen.Recording.2022-05-09.at.3.02.00.PM.mov

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[juliaElastic]

I tested locally from Add integration -> Add Elastic Agent to your hosts and I'm getting this error:

http://localhost:5620/app/integrations/detail/tomcat-1.4.0/policies?addAgentToPolicyId=b0c164d0-d053-11ec-b639-2b4762658454

[kpollich]

I tested locally from Add integration -> Add Elastic Agent to your hosts and I'm getting this error

@juliaElastic - this is fixed in a48fae5. Error was caught by our Cypress tests too 🥳

[juliaElastic]

LGTM

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 0dffdd7
• Storybooks Preview
• Webpack Bundle Analyzer

Failed CI Steps

• Fleet Cypress Tests

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
fleet	620	621	+1

Async chunks

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

id	before	after	diff
fleet	704.2KB	704.4KB	+179.0B

Page load bundle

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

id	before	after	diff
fleet	90.4KB	90.9KB	+562.0B

History

• 💔 Build #43756 failed 1aabc76
• 💔 Build #43727 failed 54123bc
• 💔 Build #43638 failed 7a63e74
• 💔 Build #43630 failed a48fae5
• 💔 Build #43455 failed f640da5
• 💔 Build #43446 failed 0843bb7

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @kpollich