Hide site elements if render in iframe

[VladyslavTy]

Change description

We need to hide the elements like header, footer, nav panel if the site is rendered in iframe. These changes is a part of Seertech IDP integration for Snowflake customer. ENG-714

Added event listener that check if the site is render in iframe.
If yes - add the display: none !important; to the styles of choosen elements by their className classesToHide
If no - nothing changes

Type of change

• Bug fix (fixes an issue)
• New feature (adds functionality)

Related issues

Fix #1

Checklists

Development

• Lint rules pass locally
• Application changes have been tested thoroughly
• Automated tests covering modified code pass

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

Code review

• Pull request has a descriptive title and context useful to a reviewer. Screenshots or screencasts are attached as necessary
• "Ready for review" label attached and reviewers assigned
• Changes have been reviewed by at least one other contributor
• Pull request linked to task tracker where applicable

[github-actions]

Checking git merge conflicts against https://github.com/openedx/edx-platform.git

Comparing with	open-release/nutmeg.master
Benchmark conflicts with main	301
Current conflicts	302
Summary	Adds 1 new conflicts. How can we do better?

New conflicting files with 'open-release/nutmeg.master'

lms/static/sass/shared-v2/_base.scss
lms/templates/main.html

Comparing with	master
Benchmark conflicts with main	331
Current conflicts	332
Summary	Adds 1 new conflicts. How can we do better?

New conflicting files with 'master'

lms/static/sass/shared-v2/_base.scss
lms/templates/main.html