fix(operator): wait for PVC expansion before auto-grow

[bpopadiuk]

Codex (GPT-5):

What

Add an in-flight guard to operator-owned PVC auto-growth.

The operator now waits when any matching PVC:

• requests more storage than status.capacity reports,
• has no reported capacity yet, or
• reports FileSystemResizePending=True.

While waiting, it retains the current requested size and reports StorageAutoGrowInProgress with requested/reported sizes and observed usage.

Why

Without this guard, a PVC request could advance from one increment to the next on successive reconciles before the CSI/filesystem expansion completed. A 20 GiB Starter disk under pressure could therefore leap through 30 GiB and 40 GiB toward its cap instead of applying one bounded step at a time.

This is the operator dependency for https://github.com/antflydb/colony/issues/365.

Impact

• Prevents overlapping auto-grow decisions.
• Does not shrink storage.
• Does not alter clusters with auto-grow disabled.
• Keeps expansion state visible through existing typed status and conditions.

Checks

• go test ./controllers/antfly -run 'TestReconcile(StorageAutoGrow|PVCExpansion)' -count=1
• go test ./controllers/antfly -count=1
• git diff --check