Task#1243 service card layout broken

[farmakiG]

Changes in this Pull Request:

• Set $enable-grid-classes to false
• Delete make-col-ready mixin from .gridLayoutForCard.

Explanation

• In Bootstrap 5.0 Beta 3 (not in previous v4.3.1), Bootstrap creates the default grid classes as follows: in class _grid a row is created by using the make-col-ready mixin. So an entry is created: .row > * with width: 100% which breaks our service grid layout as it overwrites the widths of 33,33 %, 50% and so on of the columns at the different breakpoints.

• this default behavior is enabled by a boolean: $enable-grid-classes. It is not necessary to create these clases, as we create our own columns with the .gridLayoutForCard class and make-col mixins in _commonStyles.

Mandatory checks:

• [X] Branch is up to date (latest changes were fetched from the upstream branch before creating this PR)
• [X] Changes were tested manually
• [ ] Java code changes are unit tested
• [ ] Webtests are successful

To be checked by the reviewer:

• [ ] Clean Java code and unit tested changes
• [X] UI customizablity is preserved: No hard-coded styling and URL references in JSF views

To be checked by the pull request owner:

• [ ] .MASTER/job/BES_MASTER_IT/
• [ ] .MASTER/job/OSCM_WS_Tests_INTERNAL/
• [ ] .MASTER/job/OSCM_WS_Tests_OIDC/
• [] .MASTER/job/OSCM_Integration_Tests_INTERNAL/
• [ ] .MASTER/job/OSCM_Integration_Tests_OIDC/

Cross repository and core changes:

• [ ] Interdependent changes have been communicated to the team (if applicable)
• [ ] This pull request includes high risk modifications or core changes (e.g API, datamodel, authentication...). Mandatory reviewers: @goebell or @kowalczyka.

OSCM Build References:

• est6

Screenshot (if applicable):

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This change is 

[codecov[bot]]

Codecov Report

Merging #1248 (606f855) into master (6c2bbd9) will increase coverage by 0.00%. The diff coverage is 95.83%.

@@            Coverage Diff            @@
##             master    #1248   +/-   ##
=========================================
  Coverage     55.47%   55.47%           
  Complexity    14427    14427           
=========================================
  Files          1375     1375           
  Lines         80474    80473    -1     
  Branches       8598     8598           
=========================================
  Hits          44643    44643           
+ Misses        33141    33140    -1     
  Partials       2690     2690           

Impacted Files	Coverage Δ	Complexity Δ
...nicationservice/bean/CommunicationServiceBean.java	67.67% <ø> (ø)	32.00 <0.00> (ø)
...oscm/identityservice/bean/IdentityServiceBean.java	31.37% <ø> (ø)	95.00 <0.00> (ø)
.../oscm/identityservice/control/SendMailControl.java	95.83% <95.83%> (+3.83%)	10.00 <10.00> (ø)