Load Venia loading indicator (logo.svg) via CSS

[laurentiumagureanu]

Description

Loading image (logo.svg) should be loaded from the site theme client lib.
The loading image is now loaded as background via CSS

Related Issue

CIF-1427

Motivation and Context

The logo.svg is hard coded in https://github.com/adobe/aem-core-cif-components/blob/master/react-components/src/components/LoadingIndicator/indicator.js

How Has This Been Tested?

Manually

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[codecov]

Codecov Report

Merging #312 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #312   +/-   ##
=========================================
  Coverage     64.88%   64.88%           
  Complexity      809      809           
=========================================
  Files           184      184           
  Lines          5639     5639           
  Branches        875      875           
=========================================
  Hits           3659     3659           
  Misses         1852     1852           
  Partials        128      128           

Flag	Coverage Δ	Complexity Δ
#jest	43.02% <ø> (ø)	0.00 <ø> (ø)
#karma	94.51% <ø> (ø)	0.00 <ø> (ø)
#unittests	85.77% <ø> (ø)	809.00 <ø> (ø)

Impacted Files	Coverage Δ	Complexity Δ
...nents/src/components/LoadingIndicator/indicator.js	100.00% <ø> (ø)	0.00 <0.00> (ø)

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