[ACA-2176] prevent Esc click event bubble into the Viewer

[DenysVuika]

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)

What is the new behaviour?

• prevent Escape click bubble up to the Viewer component
• should fix the case when a Node Selector dialog is displayed on top of the Overlay Viewer and user clicks Esc button (right now both of them close)

Notes: the demo shell has no ways testing it, but ACA has a failing e2e test for this

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:
https://alfresco.atlassian.net/browse/ACA-2176

[codecov-io]

Codecov Report

Merging #6378 (7605700) into develop (567ea6c) will increase coverage by 0.14%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop    #6378      +/-   ##
===========================================
+ Coverage    76.33%   76.48%   +0.14%     
===========================================
  Files          871      861      -10     
  Lines        19652    19392     -260     
  Branches      3896     3828      -68     
===========================================
- Hits         15002    14832     -170     
+ Misses        3468     3393      -75     
+ Partials      1182     1167      -15     

Impacted Files	Coverage Δ
lib/core/viewer/components/viewer.component.ts	71.13% <0.00%> (-0.59%)	⬇️
...t-node-selector/content-node-selector.component.ts	64.86% <55.55%> (-4.11%)	⬇️
...ntent-node-selector/content-node-dialog.service.ts	75.86% <100.00%> (ø)
.../lib/task-list/components/attach-form.component.ts	43.58% <0.00%> (-7.70%)	⬇️
...src/lib/document-list/data/share-data-row.model.ts	73.68% <0.00%> (-2.64%)	⬇️
lib/core/services/auth-guard.service.ts	47.36% <0.00%> (-2.64%)	⬇️
...core/directives/version-compatibility.directive.ts	66.66% <0.00%> (ø)
...t-services/src/lib/group/services/group.service.ts
...ons/src/lib/services/component-register.service.ts
lib/extensions/src/lib/config/extension-utils.ts
... and 7 more

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[eromano]

/rebase

[DenysVuika]

/rebase