Position sticky doesn't work as intended

[bfintal]

Steps:

1. Create 2 columns
2. Add a ToC block on left (or any block actually), add headings and a lot of text on right (it should be more than the height of the viewport)
3. Set the attribute of ToC block: Adv tab > Position > Position: sticky
4. Preview in frontend, the ToC block should stick to the top when scrolling past it

Notes / findings:

• There should be a top: 0 style automatically added if the position is set to sticky and there's no other position added (see block-components/advanced/style.js)
• The column .stk-inner-blocks isn't spanning the whole height of the column.

Things to test:

• The steps above should work
• Try different combinations of columns (Columns block & Column block alignments, heights) they should work as expected - we need to test this because column .stk-inner-blocks has been adjusted to 100%
  • Also try blocks that use a Column block (Feature block, Accordion block, Image box block, etc)

[bfintal]

Reopening this because the fix was causing issues to Accordions when they're placed inside Columns. Will need to revisit this one.

[bfintal]

Let's not anymore do this since now you can just set these settings on an Inner Column block to achieve sticky columns:

• Adv tab > Position > Position: Sticky
• Layout tab > Layout > Column Alignment: Start