fix(RHINENG-7083): Temporarily ignore 403 when checking hosts count

[gkarat]

Fixes https://issues.redhat.com/browse/RHINENG-7083.

This fixes the issue with users having no inventory:hosts:read permissions trying to access the /inventory page. Now, while checking for hosts count, if we get 403, we should proceed and set the loading flag to false. The permissions are further handled by the /inventory route again so it's safe.

⚠️ This is an intermediate (workaround) fix because of the time pressure (but the proper refactor PR will be open soon).

How to test

1. Have no 'inventory:hosts:read' permissions for your account
2. Navigate to /inventory
3. If you have at least one host (conventional/immutable), you should see the table rendered
4. If you don't have any hosts, you should see the "zero stage"

[gkarat]

/retest

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (c0f7e69) 57.16% compared to head (3329992) 57.14%.

Files	Patch %	Lines
src/Routes.js	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2138      +/-   ##
==========================================
- Coverage   57.16%   57.14%   -0.02%     
==========================================
  Files         194      194              
  Lines        6245     6247       +2     
  Branches     1742     1743       +1     
==========================================
  Hits         3570     3570              
- Misses       2675     2677       +2     

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[adonispuente]

LGTM, seems to be working as intended.

[gkarat]

🎉 This PR is included in version 1.64.3 🎉

The release is available on GitHub release

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