Fix: Overflow behaviour of VaCollapse

[keerthanak-tw]

closes #3931

Fix overflow behaviour of VaCollapse

Description

The VaCollapse body wrapper had a overflow hidden which would have been causing the extra content to be clipped. Changed the overflow behaviour to auto so that users will get a scrollbar when the size exceeds more than allotted.

Markup:

&__body-wrapper {
    transition: var(--va-collapse-body-wrapper-transition);
    overflow: scroll;   // Changed this to scroll from hidden

    &--bordered {
      border-bottom: 1px solid var(--va-background-border);

      .va-collapse--colored-header:not(.va-collapse--expanded) & {
        border-bottom: none;
      }

      .va-collapse--colored-body.va-collapse--expanded & {
        border-bottom: none;
      }
    }
  }

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

[m0ksem]

@asvae, I added new story about collapse overflow, if you think it needs some changes, please, make a separate issue.