Timeline - Add testIDs

[adids1221]

Description

TimeLine component testID prop set to use for testing improvements, passed to the sub components: Line, Point.

Changelog

TimeLine testID prop.

Additional info

None

[Inbal-Tish]

@adids1221 What I miss most in this PR is a test driver and maybe some tests... WDYT?

[adids1221]

@Inbal-Tish I agree, not sure if it should be in this PR.
I'll create new one based on this branch.

[Inbal-Tish]

@Inbal-Tish I agree, not sure if it should be in this PR. I'll create new one based on this branch.

I think the driver should be on the same PR so we can understand the use of these testIDs.

[adids1221]

@Inbal-Tish I already started new PR, I'll finish the work there and I'll move the file here.

[adids1221]

@Inbal-Tish about getPoint in the driver, do you think it should include getIcon & getLabel under Point?

[adids1221]

@Inbal-Tish I refactor the driver as we spoke, added some basic sanity test for timeline exists, point with icon/label and custom color, top/bottom lines