[Enhancement] Method check a map with containsKey(), before using get() [WebhookUtil]

[Alonexc]

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• I had searched in the issues and found no similar issues.

Enhancement Request

located at:
eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/util/WebhookUtil.java line 93
analysis and explanation:
This method checks for the presence of a key in a map using containsKey(), before attempting to fetch the value of the key using get(). This equates to doing two map lookups in a row.

Describe the solution you'd like

It is much simpler to just fetch the value with get, and checking for non null instead.
reference:

Are you willing to submit PR?

• Yes I am willing to submit a PR!