[ACA-3551] Show vs View button for attach widget.

[sivakumar414ram]

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:

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

https://issues.alfresco.com/jira/browse/ACA-3551

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:

[eromano]

/rebase

[codecov-commenter]

Codecov Report

Merging #5850 into develop will increase coverage by 0.32%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #5850      +/-   ##
===========================================
+ Coverage    76.06%   76.39%   +0.32%     
===========================================
  Files          843      834       -9     
  Lines        18726    18472     -254     
  Branches      3684     3617      -67     
===========================================
- Hits         14244    14111     -133     
+ Misses        3361     3251     -110     
+ Partials      1121     1110      -11     

Impacted Files	Coverage Δ
.../lib/task-list/components/attach-form.component.ts	43.58% <0.00%> (ø)
...b/extensions/src/lib/services/extension.service.ts
lib/extensions/src/lib/config/extension-utils.ts
...sions/src/lib/services/extension-loader.service.ts
lib/extensions/src/test.ts
lib/extensions/src/lib/config/action.extensions.ts
lib/extensions/src/lib/services/rule.service.ts
...b/extensions/src/lib/evaluators/core.evaluators.ts
...ons/src/lib/services/component-register.service.ts
.../components/dynamic-component/dynamic.component.ts

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