[3.0] Modified IS-Dockerfiles to have OS based base image and adoptium JDK

[gershom96]

Purpose

Changed the dockerfiles to have a base OS image with JDK installed on top of it, instead of directly importing a jdk installed image. Furthermore, brought the dockerfiles to a common format according to what was done in https://github.com/wso2/docker-is/pull/316 and https://github.com/wso2/docker-is/pull/318.

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes/no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Related PRs

https://github.com/wso2/docker-is/pull/318 https://github.com/wso2/docker-is/pull/316

[CLAassistant]

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