v6.1.5

## What's Changed
* fix: use createPortal for FeatureOptInBanner to avoid Intercom widget conflict by @eunjae-lee in https://github.com/calcom/cal.com/pull/27121
* chore: use gh auth login with token for commit step in draft-release job by @ThyMinimalDev in https://github.com/calcom/cal.com/pull/27248
* feat: organization upgrade flow v3 by @sean-brydon in https://github.com/calcom/cal.com/pull/25972
* feat: add multi-step download app dropdown with platform-specific options by @PeerRich in https://github.com/calcom/cal.com/pull/27211
* chore: hide download booking button by @Udit-takkar in https://github.com/calcom/cal.com/pull/27255
* fix: remove sticky positioning from page headers in pages on scroll by @eeshm in https://github.com/calcom/cal.com/pull/27242
* style(ui): improve padding for VerticalTabItem by @barathraj048 in https://github.com/calcom/cal.com/pull/27251
* fix: disable prefetch on team page event type links to prevent Google rate limits by @emrysal in https://github.com/calcom/cal.com/pull/27260
* feat: add tooltip to `assigned` badge by @dhairyashiil in https://github.com/calcom/cal.com/pull/27262
* refactor(companion): simplify context menu  by @betomoedano in https://github.com/calcom/cal.com/pull/27265
* fix: replace by_team_admins with by_team_admin in dynamic i18n keys by @devin-ai-integration[bot] in https://github.com/calcom/cal.com/pull/27270
* chore: companion version upgrade 1.0.2 by @dhairyashiil in https://github.com/calcom/cal.com/pull/27266
* fix: Improve the error handling in Stripe collectCard method by @hbjORbj in https://github.com/calcom/cal.com/pull/27249
* feat: add token refresh lifecycle callbacks to CalProvider by @ThyMinimalDev in https://github.com/calcom/cal.com/pull/25203
* feat: add proration invoice and reminder email templates by @sean-brydon in https://github.com/calcom/cal.com/pull/27246
* fix: sub-teams joining via token from api v2  by @sean-brydon in https://github.com/calcom/cal.com/pull/27284
* revert: remove link cloaking restrictions (reverts #26292 and #26528) by @PeerRich in https://github.com/calcom/cal.com/pull/27289
* fix: lowercase identifier values in routing form editor by @PeerRich in https://github.com/calcom/cal.com/pull/26616
* revert: chore: use gh auth login with token for commit step in draft-release job by @ThyMinimalDev in https://github.com/calcom/cal.com/pull/27293
* fix: Salesforce tokens add `token_lifetime` by @joeauyeung in https://github.com/calcom/cal.com/pull/27264

## New Contributors
* @barathraj048 made their first contribution in https://github.com/calcom/cal.com/pull/27251

**Full Changelog**: https://github.com/calcom/cal.com/compare/v6.1.4...v6.1.5