Add class for styling modal shipping-address

[mrtuvn]

Description (*)

Add class for able to styling modal form address shipping. Without specific class Frontend devs not able to complete style entire modal without impact to other modal in checkout (modal-footer/modal-header v.v..)

Before

.modal-popup #opc-new-shipping-address {//some code}
.modal-popup .modal-inner-wrap {//some code but cannot select outer element of modal for styling}
.modal-popup {/*too generic class and impact to other element  modal*/}

After

.modal-popup.new-shipping-address-modal {//some styles}
.new-shipping-address-modal {//styles }

.new-shipping-address-modal .modal-inner-wrap {//some styles}
.new-shipping-address-modal .modal-header {//styles}
.new-shipping-address-modal .modal-footer {//styles}

Target exactly modal without affects to other modal

### Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

Resolved issues:

1. resolves [Issue] Add class for styling modal shipping-address #36647: Add class for styling modal shipping-address

[m2-assistant]

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[mrtuvn]

@magento run all tests

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[mrtuvn]

@magento run Integration Tests

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[engcom-Delta]

@magento create issue

[andrewbess]

This PR already merged and shouldn't have pending review status