azkaban / azkaban / 6024

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Add support for multiple external links on the Flow Execution page (#2775)

Changes include:

-Add new Azkaban configs to support multiple external links in the UI. The configs are:
azkaban.server.external.analyzer.topics
azkaban.server.external.analyzer.${topic}.label
azkaban.server.external.analyzer.${topic}.url

To have 2 external links, for example, following configs should be added to the web server configuration file (azkaban.properties) :
azkaban.server.external.analyzer.topics=myAwesomelLink,anotherExternalLink

azkaban.server.external.analyzer.myAwesomelLink.label= My Awesome Link
azkaban.server.external.analyzer.myAwesomelLink.url =https://my-awesome-link.com/

azkaban.server.external.analyzer.anotherExternalLink.label= Another External Link
azkaban.server.external.analyzer.anotherExternalLink.url =https://another-external-link.com/

Each link configured will be presented in the UI as a button.

-Add method to validate external links. If validation fails, the link (a button) will not be clickable in the UI.
An additional property can be set in the azkaban.properties file to essentially configure the max validation time
azkaban.server.external.analyzer.timeout.ms 
If not configured, the default value is 3 milliseconds.

Co-authored-by: Helen Yang <hayang@linkedin.com>

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