Robot Framework 7.0 changes

Update robot code syntax overall in the repo

Changes:
- Update the requirement.txt package version for robot
- The '[Return]' setting is deprecated.
Use the

Robot Framework 7.0 changes

Update robot code syntax overall in the repo

Changes:
- Update the requirement.txt package version for robot
- The '[Return]' setting is deprecated.
Use the 'RETURN' statement instead.
- Singular section headers like '*** Test Case ***'
are deprecated. Use plural format like
'*** Test Cases ***' instead.
- Singular section headers like '*** Variable ***'
are deprecated

Tested:
- Ran from sandbox with the version
$ robot --version
Robot Framework 7.0 (Python 3.10.12 on linux)

and also tested on latest python version

Robot Framework 7.0 (Python 3.11.9 on linux)

Change-Id: I54e85f9d799556c63b9a39f79483f83e9b980768
Signed-off-by: George Keishing <gkeishin@in.ibm.com>

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Fix test cases name tags under redfish directory

Change-Id: Icec85bd3b11f541c185a9242191096774d04290e
Signed-off-by: George Keishing <gkeishin@in.ibm.com>

Adding new power test cases for PowerSubsystem.

Signed-off-by: Marissa Garza <garzam@us.ibm.com>
Change-Id: I8c85d6d23e777512dff9fb3eda85ead04d289652