Follow up issues on Shields adblock section in settings

[nullhook]

Fine-tune the Shield's Adblock settings frontend:

• Add "Fade out" of filter lists at the bottom
• First title of the page should be "Content filters" and not "Content Filtering"
• Casing inconsistencies - "Custom Filters" -> "Custom filters"
• "Custom lists" table section title should be 14px not 12px
• Colors in the table:
  • Table heading color
  • Different row bg based on if the item is enabled
  • Red color for "Download failure"
• Last updated should show time last updated even if latest try was failure
• Subtitles get their different color style

Design

Figma link: https://www.figma.com/file/tLXWGCpNoiJxDZDdpfordj/branch/A3RrnDB8Iib4k2ExACTNpM/Desktop-Settings

[antonok-edm]

Two more now that brave/brave-core#13421 is merged:

• title field from the list data can be shown instead of the subscription URL, if available (and the column header should change from List URL to just Filter list)
• homepage field from the list data can be presented as an additional link in the subscription's dropdown menu, if available

see older designs from #8107 for reference

[nullhook]

Created a separate issue for the following as they're more invovled:

1. "Reset to defaults" as it's more involved: Add "Reset to defaults" for adblock #23309
2. Url validation Add URL validation in Adblock custom filters #23310
3. Update and extend List URLs table #23341

[MadhaviSeelam]

Verification PASSED using

Brave | 1.41.65 Chromium: 103.0.5060.42 (Official Build) nightly (64-bit)
-- | --
Revision | de0d840bf9439c31bd86bf74f065c31fdf9b208d-refs/branch-heads/5060@{#667}
OS | Windows 11 Version 21H2 (Build 22000.739)

Case 1:brave://adblock redirect to brave://settings/shields/filters - PASSED

1. Install 1.41.65
2. Launch brave
3. Load brave://adblock
4. Confirmed the redirect to brave://settings/shields/filters
5. Confirmed brave://settings/shields/filters in a new tab loads successfully
6. Also confirmed the UI matches to Figma screenshot in the PR

Step 4	Step 5&6

Case 2: Filter Lists link in the Shields panel redirects to brave://settings/shields/filters in NTP- PASSED

1. Launch brave
2. Load brave.com
3. Click to open Shields panel
4. Expand Advanced Controls
5. Click Filter lists
6. Confirmed brave://settings/shields/filters opens in NTP

Step5	Step6

[aguscruiz]

Updated figma link here:
https://www.figma.com/file/tLXWGCpNoiJxDZDdpfordj/branch/A3RrnDB8Iib4k2ExACTNpM/Desktop-Settings?node-id=1636%3A30096