Set GDAL_DEV_SUFFIX to the pre-release suffix if a corresponding Git tag was found

[SunBlack]

As noted in #11315 as a side note, I wondered why we are getting as ${GDAL_VERSION} 3.10.0dev and not just 3.10.0 when checking out a release tag via:

git clone --depth 1 --branch v3.10.0 https://github.com/OSGeo/gdal.git .

Reason is, that the suffix dev will be always added when the .git directory is present even the GDAL_RELEASE_NAME (within gdal_version.h.in) doesn't contain it anymore. Therefore I added a logic to parse the git tags.

Results (from CMake output) when switching between different tags or current master:

• master:

  -- GDAL_VERSION          = 3.11.0dev
  -- GDAL_ABI_FULL_VERSION = 311
  

• Tag 3.10.0

  -- GDAL_VERSION          = 3.10.0
  -- GDAL_ABI_FULL_VERSION = 310
  

• Tag 3.10.0RC3 (same Git revision as the release version)

  -- GDAL_VERSION          = 3.10.0
  -- GDAL_ABI_FULL_VERSION = 310
  

• Tag 3.10.0RC2

  -- GDAL_VERSION          = 3.10.0RC2
  -- GDAL_ABI_FULL_VERSION = 310
  

• Tag 3.10.0beta1

  -- GDAL_VERSION          = 3.10.0beta1
  -- GDAL_ABI_FULL_VERSION = 310
  

As far as I can see ${GDAL_DEV_SUFFIX} is only used to setup ${GDAL_VERSION} and didn't found any code which parses ${GDAL_VERSION} (so it is only handled as string), so I think there should be no side effect.

// Note: Not sure about the coding guide lines related to CMake, as sometimes the indentation is two spaces and sometimes 4, sometimes the temporary variables are uppercase, sometimes lowercase, not sure about line length limit, ....