[hotfix] Add icon for Flink in IntellijIdea and Toolbox

[snuyanzin]

What is the purpose of the change

The PR adds icon (was taken from https://flink.apache.org/material.html) which will be shown in Intellijidea toolbox or Intellijidea recent projects like

and

Similar change is applied to other opensource projects like
Gradle: gradle/gradle#12733
Junit5: junit-team/junit-framework#2240
Apache JMeter: apache/jmeter#579
Apache Calcite: apache/calcite#1897

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): ( no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): ( no)
• The serializers: ( no)
• The runtime per-record code paths (performance sensitive): ( no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: ( no )
• The S3 file system connector: ( no )

Documentation

• Does this pull request introduce a new feature? ( no)
• If yes, how is the feature documented? (not applicable)

[flinkbot]

CI report:

• 7a4b9e4 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[snuyanzin]

@flinkbot run azure

[Samrat002]

this is really cool 👍🏻

[MartijnVisser]

I like it, thanks :)