E2E verify OAP cluster model data aggregation and fix `SelfRemoteClient` self observing metrics. (#8481)

* E2E: verify OAP cluster model data aggregation.
* Fix `SelfRemoteClient` self observing metrics.
* Remove unnecessary storage cases in the cluster e2e.
* Add steps in cluster e2e to verify the whole cluster is up
* update the doc

Co-authored-by: Nlitexu <litexu@tencent.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Follow protocol grammar fix `GCPhrase -> GCPhase`

* Fix doc.

Support Apache IoTDB as a storage option, mostly refer to previous InfluxDB storage option.
* The Design of Apache IoTDB Storage Option, https://skywalking.apache.org/blog/2021-11-23-design-of-iotdb-storage-option/

Co-authored-by: Nyuzhongyu <yuzhongyu@cestc.cn>

Fix ElasticSearch implementation of `queryMetricsValues` and `readLabeledMetricsValues` doesn't fill default values (#8012)

* Fix ElasticSearch implementation of `queryMetricsValues` and `readLabeledMetricsValues` doesn't fill default values
* Change generated file path.

Add a GraphQL query to get OAP version, display OAP version in startup message and error logs (#8004)

* Replace e2e cases to e2e-v2: Kafka: Base, Meter, Log, Profile
* Set `SW_KAFKA_FETCHER_ENABLE_NATIVE_PROTO_LOG`, `SW_KAFKA_FETCHER_ENABLE_NATIVE_JSON_LOG` default `true`.

* Support `!= null` in OAL engine.
* Add `Message Queue Consuming Count` metric for MQ consuming service and endpoint.
* Add `Message Queue Avg Consuming Latency` metric for MQ consuming service and endpoint.
* Document with a new menu in the `tracing` catalog is added

* Remove component definitions in Java codes. component-libraries.yml controls the ownership now.

* Remove useless codes.

* [maven-release-plugin] prepare release v8.8.0

* [maven-release-plugin] prepare for next development iteration

* Create changes-8.8.0.md

* Reset changelog for 8.9.0

* [maven-release-plugin] prepare release v8.7.0

* [maven-release-plugin] prepare for next development iteration