chore: update the anti-spam banner message

[Alam-2U]

Description

Updated the anti-spam message .

Ticket

https://2u-internal.atlassian.net/browse/COSMO2-819

[Copilot]

Pull request overview

Updates the anti-spam warning copy shown on the discussions home page to explicitly mention external groups such as WhatsApp, improving clarity for learners.

Changes:

• Updated spamWarningMessage default text to include an explicit WhatsApp example.
• Updated the SpamWarningBanner bolded substring to match the new message text.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/discussions/messages.js	Updates the default anti-spam banner message copy.
src/components/SpamWarningBanner.jsx	Keeps the bolded substring in sync with the updated message copy.

Comments suppressed due to low confidence (1)

src/components/SpamWarningBanner.jsx:66

• The bolding logic depends on finding an exact hard-coded English substring inside the localized message (msg.indexOf(boldText)). This is brittle (any copy tweak requires updating boldText) and it won’t work for non-English translations (the substring won’t be found, so nothing is bolded). Consider switching to a single i18n message that marks the bold portion via a placeholder/rich-text value (e.g., FormattedMessage with a values function) or splitting the message into pre/bold/post segments using separate message IDs.

              const msg = intl.formatMessage(messages.spamWarningMessage);
              const boldText = 'never invite you to join external groups, such as on WhatsApp, or ask for personal or financial information';
              const idx = msg.indexOf(boldText);
              if (idx === -1) {
                return msg;
              }
              return (
                <>
                  {msg.slice(0, idx)}
                  <strong>{boldText}</strong>
                  {msg.slice(idx + boldText.length)}
                </>

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