Update vpn paywall discount text behavior

[deeppandya]

Description

Renews annually has html tags that's should not be shown.

Steps to reproduce

1. Install fresh profile
2. Go to Brave VPN Paywall page

Actual result

Expected result

Html tags shouldn't be shown while waiting for the response from play services.

Reproduces how often

Easily reproduced

Brave version

release channel 1.71.121

Device

• Brand/model: Pixel 7pro
• Android version: 15

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

No response

[deeppandya]

CC @srirambv

[hffvld]

Verified on Pixel 7 using version(s):

Device/OS: Pixel 7 / panther_beta-user 15 AP41.240925.009 release-keys
Brave build: 1.74.8
Chromium: 131.0.6778.69 (Official Build) beta (64-bit) 

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STEPS:

1. Follow the STR/TP from Update vpn paywall discount text behavior #42105 (comment)
2. Verify

ACTUAL RESULTS:

• Verified that HTML tags are not exposed on the VPN paywall.

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