Replace "HTTPS Upgrades" stat with "Bandwidth saved" stat

[rebron]

Description

Follow-up to #8256 (which added the "Estimated Bandwidth Saved" stat and pushed out the content).

• Remove HTTPS Upgrades stat and label.
• Replace with the same formatting and location with stat and "Bandwidth saved" label.
• Fix sentence casing so it reads "Trackers & ads blocked" and "Time saved"

Actual result:

Design

Reproduces how often:

n/a

Brave version (brave://version info)

n/a

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a
• Can you reproduce this issue with the beta channel? n/a
• Can you reproduce this issue with the dev channel? n/a
• Can you reproduce this issue with the nightly channel? n/a

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? n/a
• Does the issue resolve itself when disabling Brave Rewards? n/a
• Is the issue reproducible on the latest version of Chrome? n/a

Miscellaneous Information:

Check l10n strings for "Estimated Bandwidth Saved" and possible alternate text so that layout flows properly with longer translations.

[rebron]

cc: @bradleyrichter

[karenkliu]

designs added!

[rebron]

@AndriusA Can you grab this one?

[bsclifton]

Setting missing milestone to 1.10

[btlechowski]

@rebron I am confused about expected behavior. Should Bandwidth saved stat be shown in 1.10.x?

Right now HTTPS Upgrades is hidden, but Bandwidth saved is not shown:

Brave	1.10.71 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
Revision	8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS	Ubuntu 18.04 LTS

[btlechowski]

Verification passed on

Brave	1.10.74 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
Revision	8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS	Ubuntu 18.04 LTS

The stats stings are not translated. Logged #9990
The Estimated bandwidth saved stat is not shown on clean install. Logged #9993

Verified the test plan from the description.
Verified Estimated bandwidth saved stat is shown

Verified Estimated bandwidth saved stat is retained after restart

Verification passed on

Brave | 1.10.77 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
-- | --
Revision | 8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS | Windows 10 OS Version 1803 (Build 17134.1006)

• The Estimated bandwidth saved stat is not shown on clean install. Encountered [Desktop] NTP Estimated bandwidth saved stat is not shown on clean install #9993
• Verified the test plan from the description.
• Verified Estimated bandwidth saved stat is shown
• Verified Estimated bandwidth saved stat is retained after browser restart
  

---

Verified passed with

Brave | 1.10.79 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
-- | --
Revision | 8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS | macOS Version 10.14.6 (Build 18G3020)

• Encountered [Desktop] NTP Estimated bandwidth saved stat is not shown on clean install #9993 - bandwidth stat is not shown on clean install until it is > 0.
• Confirmed on a clean install once I started visiting pages and the stat was > 0, the stat displayed on the NTP:

• Confirmed stat also displayed on upgrade (from 1.9.x) profile:

• Encountered Remove "Estimated" from bandwidth saved and time saved #9838 and Update NTP Brave Stats to 'Trackers & Ads Blocked' on desktop #9692 for renaming of stats.