Remove deprecation warning for fetchImage in 1.57

[OmarShehata]

The createImageBitmap PR #7579 changed the parameters for Resource.fetchImage and added a deprecation warning:

https://github.com/AnalyticalGraphicsInc/cesium/blob/master/Source/Core/Resource.js#L900

Which should be removed in 1.57.

Can we add the deprecation label? @hpinkos

It also looks like Resource.addQueryParameters deprecation warning was supposed to be removed in 1.45:

https://github.com/AnalyticalGraphicsInc/cesium/blob/master/Source/Core/Resource.js#L612

[lilleyse]

I changed the title and description to 1.57 since the PR that deprecated the behavior was merged this month and needs at least one month of being deprecated.

Though I opened #7695 to remove addQueryParameters and addTemplateValues.

[tfili]

@OmarShehata Can you remove the deprecation warning for the next release?

[tfili]

Fixed in #7799