Fix part of #15968: Replace material icons with FA icons

[Sakshi-75]

Overview

1. This PR fixes part of Replace Material Icons with Font Awesome icons #15968.
2. This PR does the following: In this PR the material icons have been replaced with their respective Font Awesome icons for the following files:

• oppia/core/templates/components/summary-tile/collection-summary-tile.component.html
• oppia/core/templates/components/summary-tile/exploration-summary-tile.component.html
• oppia/core/templates/components/summary-tile/story-summary-tile.component.html

Essential Checklist

• The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• The linter/Karma presubmit checks have passed locally on your machine.
• "Allow edits from maintainers" is checked. (See here for instructions on how to enable it.)
  • This lets reviewers restart your CircleCI tests for you.
• The PR is made from a branch that's not called "develop".

Proof that changes are correct

Proof of changes on desktop with slow/throttled network

• oppia/core/templates/components/summary-tile/collection-summary-tile.component.html

1. Bullet separator:
   Before:
   
   After:
   

• oppia/core/templates/components/summary-tile/exploration-summary-tile.component.html

1. Bullet separator:
   Before:
   
   After:
   

• oppia/core/templates/components/summary-tile/story-summary-tile.component.html

1. Up arrow
   Before:
   
   After:
   

2. Down arrow
   Before:
   
   After:
   

3. Done
   Before:
   
   After:
   

4. Up arrow (mobile view)
   Before:
   
   After:
   

5. Down arrow (mobile view)
   Before:
   
   After:
   

Proof of changes on mobile phone

Proof of changes in Arabic language

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[oppiabot]

Hi @Sakshi-75, can you complete the following:

1. The karma and linter checklist has not been checked, please make sure to run the frontend tests and lint tests before pushing.
   Thanks!

[oppiabot]

Hi @ashutoshc8101, could you please add the appropriate changelog label to this pull request? Thanks!

[oppiabot]

Unassigning @ashutoshc8101 since they have already approved the PR.