fix: prevent HTML encoding in names

[Anshumancanrock]

What does this PR do?

• Fixes #XXXX (GitHub issue number)
• Fixes CAL-XXXX (Linear issue number - should be visible at the bottom of the GitHub issue description)

Visual Demo (For contributors especially)

A visual demonstration is strongly recommended, for both the original and new change (video / image - any one).

Video Demo (if applicable):

• Show screen recordings of the issue or feature.
• Demonstrate how to reproduce the issue, the behavior before and after the change.

Image Demo (if applicable):

• Add side-by-side screenshots of the original and updated change.
• Highlight any significant change(s).

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

• Are there environment variables that should be set?
• What are the minimal test data to have?
• What is expected (happy path) to have (input and output)?
• Any other important info that could help to test that PR

Checklist

• I haven't read the contributing guide
• My code doesn't follow the style guidelines of this project
• I haven't commented my code, particularly in hard-to-understand areas
• I haven't checked if my changes generate no new warnings

---

Summary by cubic

Ensures names and other interpolated values in email subjects and body render correctly without HTML entities. Fixes misencoded names across scheduling, reschedule, refund, and credit balance emails.

• Bug Fixes
  • Disabled i18n HTML escaping for interpolated values (escapeValue: false) in relevant email templates.
  • Updated attendee/organizer scheduling and rescheduling templates, refund failed, credit balance limit/low warning, and BaseScheduledEmail.

^{Written for commit 9945ead. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 8 files