feat: Allow admin to search users by lastName and email

[iamareebjamal]

Fixes #5081

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[niranjan94]

Here is an overview of what got changed by this pull request:

Complexity increasing per file
==============================
- app/mixins/ember-table-route.js  1
         

See the complete overview on Codacy

[codecov]

Codecov Report

Merging #5246 into development will increase coverage by 0.02%.
The diff coverage is 57.14%.

@@               Coverage Diff               @@
##           development    #5246      +/-   ##
===============================================
+ Coverage        22.75%   22.78%   +0.02%     
===============================================
  Files              490      491       +1     
  Lines             5207     5223      +16     
  Branches            36       36              
===============================================
+ Hits              1185     1190       +5     
- Misses            4017     4028      +11     
  Partials             5        5              

Impacted Files	Coverage Δ
app/controllers/admin/users/list.js	0.00% <0.00%> (ø)
app/routes/admin/users/list.js	0.00% <0.00%> (ø)
app/mixins/ember-table-route.js	75.00% <72.72%> (-1.93%)	⬇️
app/routes/admin/sales/index.js	0.00% <0.00%> (ø)
app/controllers/admin/sales/index.js	0.00% <0.00%> (ø)

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