[Styles] Update the paste, review, and install filebeat screen styles

[Bargs]

Paste Screen

• Fixed header and descriptive text
• Fixed textarea color and borders
• Pulled some of the styles from the pipeline screen code into a reusable _add_data_wizard.less file for styles that apply across all of the wizards.

Review Screen

• Fixed header and descriptive text
• Matched styling of other Add Data form controls
• Updated style of paginated table
• Pulled index pattern descriptive text out tool tip and placed it below the inupt label
• Placed more styles in the generic Add data wizard stylesheet

Install Filebeat Screen

• Updated header text
• Added bold taglines
• Added info-circle icons to doc links
• Adjusted index checker style

[Bargs]

jenkins, test it

[BigFunger]

Do we want to make this 450px like the pipeline-setup step? @alt74

[Bargs]

@alt74 for reference, here's how 250px and 450px look, respectively. To me 450px looks a bit odd here since it starts out as a giant empty box.

[BigFunger]

src/plugins/kibana/public/settings/sections/indices/filebeat/styles/_filebeat_wizard.less
The 'common styles?' section needs to be addressed, although I don't think it's a blocker.

Added #7095 to address this

[BigFunger]

LGTM

[alt74]

@Bargs @BigFunger around 250 px height for the sample logs box works for me (1. Paste screen). A really large box creates the impression I have to paste a lot of example logs.