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The project has files related to CI/CD process in its repository, such as Travis-CI and GitHub Actions configurations.
Can they be classified as source code? Should I put copyright notice into them (all other files (*.java, *.xml, etc) in the project have copyright notice).
Copyright notices are not required, but it would be reasonably common to add such notices to scripts and config files as well. There is no fundamental difference between a Java program, a shell script, and an actions.yml file.
Those individual files may or may not be copyrightable in your jurisdiction, but we can't know that up front. If a project has a policy of using such copyright notices, put them everywhere.
