OU-458: move the trace pages initial loading state to the tempo stack dropdown

[jgbernalp]

This PR includes:

• Move the loading state to the dropdown to unblock the initial page load
• Adjust the tempo list api to use the backend plugin proxy
• Add a loading state to the useTempoStacks hook

[openshift-ci-robot]

@jgbernalp: This pull request references OU-458 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.17.0" version, but no target version was set.

In response to this:

This PR includes:

• Move the loading state to the dropdown to unblock the initial page load
• Adjust the tempo list api to use the backend plugin proxy
• Add a loading state to the useTempoStacks hook

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[jgbernalp]

/cherry-pick release-0.1

[openshift-cherrypick-robot]

@jgbernalp: once the present PR merges, I will cherry-pick it on top of release-0.1 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.1

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[openshift-ci]

@jgbernalp: all tests passed!

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[zhuje]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jgbernalp, zhuje

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• OWNERS [jgbernalp,zhuje]

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[openshift-cherrypick-robot]

@jgbernalp: #19 failed to apply on top of branch "release-0.1":

Applying: move the trace pages initial loading state to the tempo stack dropdown
Using index info to reconstruct a base tree...
M	web/src/components/TracingPage.tsx
Falling back to patching base and 3-way merge...
Auto-merging web/src/components/TracingPage.tsx
CONFLICT (content): Merge conflict in web/src/components/TracingPage.tsx
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 move the trace pages initial loading state to the tempo stack dropdown
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-0.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.