chore(openapi-codegen): drop spec post-processing workarounds

Upstream gdc-nas (DX-346) cleaned the OpenAPI spec so the regen pipeline no longer needs local repairs:

- Drop the NUL-stripping `tr` after the jq merge — `DeclarativeColumn.name` no longer carries a `^[^NUL]*$` pattern that leaked literal NUL bytes through jq decoding.
- Drop the jq cycle-break on `DashboardCompoundComparisonCondition` / `DashboardCompoundRangeCondition` — Springdoc no longer emits the redundant child-to-parent `allOf: [{$ref: ...}]` that crashed openapi-generator-cli v6.6.0 with StackOverflowError in `recursiveGetDiscriminator`.
- Drop the `scripts/postprocess_api_client.py` invocation and delete the script — it only existed to repair regex patterns mangled by the now-absent NUL escape.
- Repoint `make api-client STAGING=1` from `demo-cicd.cloud.gooddata.com` (production) to `staging.dev-latest.stg11.panther.intgdc.com` (actual staging). The previous URL silently regenerated against production and would re-introduce the workarounds.

Verified by regenerating the client against staging with the workarounds removed: no StackOverflowError, no NUL bytes in the merged spec, no mangled regex in the generated Python.

JIRA: DX-346
risk: low

Author: jaceksan

Makefile

@@ -8,9 +8,9 @@ NO_CLIENT_GD_PROJECTS_ABS = $(filter-out %client, $(wildcard $(CURDIR)/packages/
 NO_CLIENT_GD_PROJECTS_DIRS = $(foreach dir, $(NO_CLIENT_GD_PROJECTS_ABS), $(notdir $(dir)))
 # TODO: replace API_VERSION in the future by call to API
 API_VERSION="v1"
-# Default: generate from localhost; use `make api-client STAGING=1` to download from remote
+# Default: generate from localhost; use `make api-client STAGING=1` to download from staging
 ifdef STAGING
-BASE_URL="https://demo-cicd.cloud.gooddata.com"
+BASE_URL="https://staging.dev-latest.stg11.panther.intgdc.com"
 else
 BASE_URL="http://localhost:3000"
 endif
@@ -61,22 +61,8 @@ endef
 .PHONY: _api-client-generate
 _api-client-generate:
 	rm -f schemas/gooddata-api-client.json
-	# Merge per-domain specs and strip literal NUL bytes that jq decoded from
-	#   escapes in the source (the previous `sed '/.../d'` pattern was a no-op:
-	# sed BRE/ERE doesn't interpret \uNNNN, so it never matched anything).
-	cat schemas/gooddata-*.json | jq -S -s 'reduce .[] as $$item ({}; . * $$item) + { tags : ( reduce .[].tags as $$item (null; . + $$item) | unique_by(.name) ) }' | tr -d '\000' > "schemas/gooddata-api-client.json"
-	# Break the DashboardCompoundConditionItem ↔ children oneOf/allOf cycle that
-	# crashes openapi-generator-cli v6.6.0 with StackOverflowError in
-	# recursiveGetDiscriminator (its walker has no visited-set). Parent has no
-	# own properties, so dropping the redundant `allOf: [{$$ref: parent}]` from
-	# each child is semantically a no-op.
-	jq '(.components.schemas.DashboardCompoundComparisonCondition.allOf) |= map(select(.["$$ref"] != "#/components/schemas/DashboardCompoundConditionItem")) | (.components.schemas.DashboardCompoundRangeCondition.allOf) |= map(select(.["$$ref"] != "#/components/schemas/DashboardCompoundConditionItem"))' schemas/gooddata-api-client.json > schemas/gooddata-api-client.json.tmp && mv schemas/gooddata-api-client.json.tmp schemas/gooddata-api-client.json
+	cat schemas/gooddata-*.json | jq -S -s 'reduce .[] as $$item ({}; . * $$item) + { tags : ( reduce .[].tags as $$item (null; . + $$item) | unique_by(.name) ) }' > "schemas/gooddata-api-client.json"
 	$(call generate_client,api)
-	# Repair regex patterns of the form ^[^\x00]*$ that openapi-generator mangles
-	# in two ways: sometimes it drops the NUL (leaving the invalid `^[^]*$`),
-	# sometimes it embeds a literal NUL byte (producing a Python source that
-	# fails to import with SyntaxError). The helper handles both shapes.
-	./scripts/postprocess_api_client.py gooddata-api-client/gooddata_api_client
 
 .PHONY: api-client
 api-client: download _api-client-generate