Remove FindBlosc2

[ax3l]

Going forward, it might be easier if we dump the dependency to 2.10.2+
https://github.com/Blosc/c-blosc2/releases/tag/v2.10.2

Related to #3903

[vicentebolea]

@ax3l thansk for the contribution, we still support blosc2 >= 2.4 without problems. I think that the issues that you found are due to the fact that blosc2 could not be installed due to depedencies missing and using as a backup this FindBlosc file.

[vicentebolea]

I rebased on the top of master, there was some unrelated CI failures in master for a two weeks.

[ax3l]

Thanks @vicentebolea

I think that the issues that you found are due to the fact that blosc2 could not be installed due to depedencies missing and using as a backup this FindBlosc file.

I cannot see a c-blosc2 install issue here:
openPMD/openPMD-api#1554

[pnorbert]

It doesn't hurt to increase the version requirement for blosc2.

[vicentebolea]

Note that we might not have an issue with our current FindBlosc2.cmake file. The error that @ax3l have been seeing it seems to be unrelated to this file.

The error that was reported at #3903 seems to be related to the blosc2config.cmake not to be found.

We might not want to arbitrarily drop dependency to older c-blosc2 since dependending on its last release might hinder users that do not have access to older c-blocs2 versions.

[vicentebolea]

This was already done at #4093. Closing