Prepare the 1.2.0 changelog

[loevgaard]

Moves the #26 / #27 entries out of the 1.1.0 section (where they landed because those PRs merged before #24) into a 1.2.0 — 2026-08-17 section with its own Added / Changed / BC notes, and adds the compare links.

Companion to the draft release v1.2.0 (target 1.x): merge this, then publish.

Release plan (drafts, both editable):

• v1.1.0 — the DX-review release. Its draft now targets commit 3762a69 (the Small additive DX items: variables(), deadlineAt/acquirer, Shopsystem, memoized callback payment, SDK version in User-Agent #19 merge — last commit before Outcome predicates, per-type/last-approved views, order_id validation, paymentMethods list #27/Per-operation callback URL on authorize/capture/refund/cancel; extra request headers; Link::$autoCapture #26 landed) instead of the branch tip, so the tag matches its notes. Caveat: the CHANGELOG inside that tag still says "Unreleased" for its content (the 1.1.0 header arrived with Prepare the 1.1.0 changelog #24, after Outcome predicates, per-type/last-approved views, order_id validation, paymentMethods list #27); if that bothers you, publish 1.1.0 from the tip instead and drop this PR + the 1.2.0 draft.
• v1.2.0 — Per-operation callback url: send QuickPay-Callback-Url on capture/refund/cancel (and model Link::$autoCapture) #22 + Result helpers, outcome predicates and request validation that setono/payum-quickpay still hand-rolls #25 (callbackUrl: on operations, extra request headers, Link::$autoCapture; outcome predicates and status views; order_id validation; paymentMethods list). Targets the 1.x tip after this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.14%. Comparing base (8188a81) to head (8dc36c7).

Additional details and impacted files

@@            Coverage Diff            @@
##                1.x      #28   +/-   ##
=========================================
  Coverage     99.14%   99.14%           
  Complexity      226      226           
=========================================
  Files            27       27           
  Lines           582      582           
=========================================
  Hits            577      577           
  Misses            5        5           

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