Update vf-blockquote with latest HTML structure and add small variant option

[bhushan-ebi]

Changes to be done to the blockquote component in WP as per the ticket #2114
Corresponding changes to HTML structure can be found at visual-framework/vf-core@6bc828e#diff-0e3d122ca4a21e0bb7e99fdcdce1c984279985a433a2582e73e72f8ce67e4f95
under the components/vf-blockquote/vf-blockquote.njk file change

[bhushan-ebi]

PR raised for the changes - #1451