feat: support configurable apisix.tracing in gateway helm chart

[guoqqqi]

Description

The gateway (api7-ee-3-gateway) has added a new configuration parameter apisix.tracing in conf/config-default.yaml:

apisix:
  tracing: false  # Enable comprehensive request lifecycle tracing (SSL/SNI, rewrite, access, header_filter, body_filter, and log).
                  # When disabled, OpenTelemetry collects only a single span per request.

However, the latest version of the gateway helm chart does not expose this parameter as a configurable value.

Expected Behavior

Users should be able to configure apisix.tracing via values.yaml:

apisix:
  tracing: false

References

• Gateway config-default.yaml: https://github.com/api7/api7-ee-3-gateway/blob/main/conf/config-default.yaml#L170