[Fleet] show dataset combo box for input packages

[juliaElastic]

Summary

Closes #145903

Added datasets combo box to input type packages Dataset name variable with the option of creating a new one.

Using the existing /data_streams API to show the list of all datasets.

Package policy create/edit API already supports setting the value of data_stream.dataset (input packages should have this variable as described in #133296)

To verify:

• Start local EPR with input type packages as described here
• Add Custom Logs integration
• Verify that Dataset name displays a dropdown and the selected value is persisted.
• Verify that a new value can be entered in Dataset name
• Verify that Edit integration policy displays the existing value and allows selecting/creating another one.

Added ordering of datasets to move up those that start with the package name e.g. system* datasets come first if adding a system integration. Other than that ordering datasets alphabetically.

The rest of the requirements seem to be already implemented, see comments

Checklist

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Unit or functional tests were updated or added to match the most common scenarios

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[juliaElastic]

this is the only real change here, look without whitespace

[nchaulet]

Should we wrap this an useEffect?

[nchaulet]

Should we not allow user to clear dataset? EuiCombobox accept isClearable=false to remove that clear button

[nchaulet]

LGTM 🚀

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: cb38df6

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
fleet	752	754	+2

Async chunks

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

id	before	after	diff
fleet	891.2KB	892.5KB	+1.3KB

Unknown metric groups

ESLint disabled in files

id	before	after	diff
osquery	1	2	+1

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
fleet	59	65	+6
osquery	109	115	+6
securitySolution	443	449	+6
total			+20

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
fleet	68	74	+6
osquery	110	117	+7
securitySolution	520	526	+6
total			+21

History

• 💔 Build #93064 failed 047d646
• 💔 Build #93019 failed 31506ac
• 💚 Build #92756 succeeded 983f473

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

cc @juliaElastic