[Usage Collection/Cloud Provider] Fix isReady bug

[afharo]

Summary

In dev mode I noticed the Telemetry plugin was log.warning that not all collectors were ready after 5 minutes after startup. After debugging, I noticed the cloud provider is causing this issue due to the logic we were running in the isReady method. Since we didn't differentiate between "fetch logic haven't run yet" and "fetch logic run but no cloud provider found", we couldn't tell when it was ready.

This PR attempts to fix that :)

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)
• This was checked for cross-browser compatibility

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[lukeelmers]

Code LGTM, thanks for catching & fixing this!

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 73b7c0f
• Storybooks Preview

Metrics [docs]

Unknown metric groups

API count

id	before	after	diff
actions	-	113	+113
advancedSettings	-	18	+18
alerting	-	200	+200
apm	-	35	+35
apmOss	-	38	+38
banners	-	9	+9
beatsManagement	-	2	+2
bfetch	-	58	+58
canvas	-	4	+4
cases	-	2	+2
charts	-	157	+157
cloud	-	19	+19
console	-	2	+2
core	-	2168	+2168
dashboard	-	138	+138
dashboardEnhanced	-	51	+51
dashboardMode	-	11	+11
data	-	3436	+3436
dataEnhanced	-	52	+52
devTools	-	9	+9
discover	-	61	+61
discoverEnhanced	-	39	+39
embeddable	-	426	+426
embeddableEnhanced	-	14	+14
encryptedSavedObjects	-	20	+20
enterpriseSearch	-	2	+2
esUiShared	-	84	+84
eventLog	-	70	+70
expressions	-	1755	+1755
features	-	199	+199
fileUpload	-	175	+175
fleet	-	1075	+1075
globalSearch	-	67	+67
home	-	91	+91
indexLifecycleManagement	-	5	+5
indexManagement	-	162	+162
indexPatternFieldEditor	-	29	+29
indexPatternManagement	-	46	+46
infra	-	14	+14
ingestPipelines	-	9	+9
inspector	-	97	+97
kibanaLegacy	-	92	+92
kibanaReact	-	232	+232
kibanaUtils	-	465	+465
lens	-	160	+160
licenseManagement	-	3	+3
licensing	-	116	+116
lists	-	251	+251
management	-	35	+35
maps	-	182	+182
mapsEms	-	69	+69
ml	-	343	+343
monitoring	-	9	+9
navigation	-	29	+29
newsfeed	-	17	+17
observability	-	157	+157
osquery	-	8	+8
presentationUtil	-	69	+69
remoteClusters	-	4	+4
reporting	-	127	+127
rollup	-	20	+20
ruleRegistry	-	19	+19
runtimeFields	-	22	+22
savedObjects	-	173	+173
savedObjectsManagement	-	91	+91
savedObjectsTagging	-	54	+54
savedObjectsTaggingOss	-	81	+81
security	-	79	+79
securityOss	-	11	+11
securitySolution	-	99	+99
share	-	66	+66
snapshotRestore	-	22	+22
spaces	-	82	+82
spacesOss	-	64	+64
stackAlerts	-	4	+4
taskManager	-	41	+41
telemetry	-	41	+41
telemetryCollectionManager	-	24	+24
telemetryCollectionXpack	-	1	+1
telemetryManagementSection	-	13	+13
timelines	-	6	+6
triggersActionsUi	-	221	+221
uiActions	-	127	+127
uiActionsEnhanced	-	185	+185
uptime	-	5	+5
urlForwarding	-	14	+14
usageCollection	-	53	+53
visTypeTimeseries	-	7	+7
visualizations	-	212	+212
total			+15167

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

[kibanamachine]

💚 Backport successful

Status	Branch	Result
✅	7.x

This backport PR will be merged automatically after passing CI.