[ACA-3678] Disable save & delete buttons for default process filters

[mcchrys]

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-3678

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-commenter]

Codecov Report

Merging #5896 into develop will increase coverage by 2.35%.
The diff coverage is 66.66%.

@@             Coverage Diff             @@
##           develop    #5896      +/-   ##
===========================================
+ Coverage    76.01%   78.37%   +2.35%     
===========================================
  Files          738      334     -404     
  Lines        16108     8877    -7231     
  Branches      3131     1768    -1363     
===========================================
- Hits         12245     6957    -5288     
+ Misses        2932     1371    -1561     
+ Partials       931      549     -382     

Impacted Files	Coverage Δ
.../components/edit-process-filter-cloud.component.ts	72.00% <50.00%> (ø)
...s-filters/services/process-filter-cloud.service.ts	73.52% <100.00%> (ø)
...omponents/filesize-cell/filesize-cell.component.ts
...hts/src/lib/mock/diagram/diagram-swimlanes.mock.ts
lib/core/services/ecm-user.service.ts
...yout/directives/sidenav-layout-header.directive.ts
lib/core/datatable/data/object-datacolumn.model.ts
...ts/src/lib/diagram/models/diagram/diagram.model.ts
.../widgets/dynamic-table/editors/text/text.editor.ts
.../widgets/dynamic-table/editors/date/date.editor.ts
... and 598 more

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