HDDS-9795. [Recon][UI][Test] Add tests for Disk Usage page

[sravani-revuri]

What changes were proposed in this pull request?

This task adds test for the Namespace/Disk usage page on recon UI

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-9795

How was this patch tested?

Ran tests.

 ✓ src/__tests__/namespaceUsage/NamespaceUsage.test.tsx > Namespace Usage page (Disk Usage) > does not fetch root usage until the user confirms load 192ms
 ✓ src/__tests__/namespaceUsage/NamespaceUsage.test.tsx > Namespace Usage page (Disk Usage) > navigates to a child path via breadcrumb submenu 115ms
 ✓ src/__tests__/namespaceUsage/NamespaceUsage.test.tsx > Namespace Usage page (Disk Usage) > navigates to a key path via breadcrumb search 199ms
 ✓ src/__tests__/namespaceUsage/NamespaceUsage.test.tsx > Namespace Usage page (Disk Usage) > shows error when usage API returns PATH_NOT_FOUND 98ms
 ✓ src/__tests__/namespaceUsage/NamespaceUsage.test.tsx > Namespace Usage page (Disk Usage) > notifies when namespace summary is still initializing 41ms

 Test Files  1 passed (1)
      Tests  5 passed (5)
   Start at  19:18:43
   Duration  3.23s (transform 123ms, setup 65ms, import 1.96s, tests 647ms, environment 430ms)

[sravani-revuri]

@chihsuan , @smengcl would you like to review this?

[chihsuan]

Sure, I'll take a look. 🙂

[smengcl]

lgtm

[chihsuan]

Thanks for working on this! @sravani-revuri Looks good overall. I left a few inline comments, mostly about the mocks.

[chihsuan]

Thanks for the patch! @sravani-revuri LGTM +1