Update messaging on NTP SI in unconnected or grandfather unverified state

[btlechowski]

In unconnected and grandfather unverified states we show message that user is paid for viewing ads.

Steps to Reproduce

1. Clean profile
2. Enable rewards and ads
3. Open NTP till NTP SI is shown

Actual result:

Message states that user is earning tokens when viewing the NTP SI
Note: Learn More opens https://brave.com/brave-rewards/

Expected result:

We should urge user to connect to the custodian

Similar to state when user has not enabled rewards:

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	1.48.132 Chromium: 109.0.5414.87 (Official Build) beta (64-bit)
Revision	2dc18eb511c56e012081b4abc9e38c81c885f7d4-refs/branch-heads/5414@{#1241}
OS	Linux

cc @tmancey @Miyayes @LaurenWags

[Miyayes]

Will remove this blue tooltip.

[Miyayes]

Uplift to 1.48.x.

[kjozwiak]

The above requires 1.48.147 or higher for 1.48.x verification 👍

[LaurenWags]

Verified with

Brave | 1.48.149 Chromium: 109.0.5414.119 (Official Build) beta (x86_64)
-- | --
Revision | 772095164c7d5d4e73160f858efed3b5e87eca83-refs/branch-heads/5414@{#1458}
OS | macOS Version 12.6.3 (Build 21G419)

Verified the test plan from brave/brave-core#16860 (comment).

1. On a new profile, confirmed that the first time the NTP SI is shown (when you have not joined Brave Rewards), there is no tooltip displayed.
2. On a new profile, confirmed that after joining Brave Rewards (no custodian connected), the first time the NTP SI is shown there is no tooltip displayed.

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