[AAE-4547] Add getInputValue() in TestElement class

[bogdanapatrichi]

• Add new method to TestElement class to be used in ADW e2e tests

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe: Add getInputValue() in TestElement class

What is the current behaviour? (You can also link to an open issue here)

What is the new behaviour?

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[codecov-io]

Codecov Report

Merging #6753 (d5c0979) into develop (9231f62) will increase coverage by 1.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6753      +/-   ##
===========================================
+ Coverage    76.40%   77.44%   +1.04%     
===========================================
  Files          882      156     -726     
  Lines        20068     4340   -15728     
  Branches      3993      854    -3139     
===========================================
- Hits         15332     3361   -11971     
+ Misses        3515      688    -2827     
+ Partials      1221      291     -930     

Impacted Files	Coverage Δ
lib/core/card-view/validators/validators.map.ts
lib/core/pipes/pipe.module.ts
...datatable/directives/loading-template.directive.ts
...ib/process-services/src/lib/app-list/icon.model.ts
...card-view-textitem/card-view-textitem.component.ts
.../src/lib/task-list/services/task-upload.service.ts
lib/core/toolbar/toolbar-divider.component.ts
...rc/lib/task/task-list/models/filter-cloud-model.ts
lib/core/toolbar/toolbar.module.ts
lib/extensions/src/lib/config/extension-utils.ts
... and 716 more

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