fix(distops): Should Be Equal As Integers for stub-count assertions

HttpCtrl's Get Stub Count returns a Python int; the literal 1 in the .robot file is a string. Robot's Should Be Equal is type-strict and fails with 1 (integer) != 1 (string) — covered by doubt #23 (closed), hit by ~12 DistOps tests.

Sweep across TP/NGSI-LD/DistributedOperations/: 35 occurrences of Should Be Equal ${stub_count} N → Should Be Equal As Integers ${stub_count} N (sed; 25 robot files touched, one-line edits).

Doubt #23 (closed) marked RESOLVED. Sibling assertions using Should Be True ${stub_count} > 0 are already int-vs-int (Python expression on int), no change needed.

Verified: D012_01_inc (which had only this blocker) now passes; tests like D003_01_red / D016_01_inc proceed past the stub-count assertion and fail on separate downstream issues out of scope here.