Updated ImmutableFileTest.cpp in order to handle the fact that kXR_ChkLenErr has been removed in XRootD 5

Updated ImmutableFileTest.cpp in order to handle the fact that XrdCl::OpenFlags::Append has been removed in XRootD 5 as requested by CTA

CMake Warning (dev) at
/usr/share/cmake3/Modules/FindPackageHandleStandardArgs.cmake:272
(message):
  The package name passed to `find_package_handle_standard_args` (gRPC)
does
  not match the name of the calling package (GRPC).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  cmake/FindGRPC.cmake:125 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  eos_cta/CMakeLists.txt:19 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

[objectstore] Fixed cta/CTA#875 gtest cannot safely print ContainerTraits<ArchiveQueue,ArchiveQueueToTransferForUser>::PoppedElementsSummary

[cmake] Fixed cta/CTA#872 Fix naming convention bug in CTA/cmake/Findxrootdclient.cmake found by cmake3

Implements "cta-admin failedrequest rm"

See merge request cta/CTA!8

Also deletes all unused options which were defined for commands that
no longer exist

Information is not a countable noun in English (it can't be plural).

Here is an example:
```
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin tapepool add --name steve --vo vo_1 --partialtapesnumber 1 --encrypted false --comment "Steve's tape pool"
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin archiveroute add --storageclass single_1 --copynb 1 --tapepool steve --comment "Steve's archive route"
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin tapepool rm --name steve
Cannot delete tape-pool steve because it is used in an archive route
[itctabuild02] ~ (krb5=ctaadmin1)>
```

Fixed cta/CTA#863 Prevent SQLite database files from being used as the CTA catalogue database backend

Created cta-lib-catalogue so that cta-migration-tools can avoid requiring cta-lib which in turn requires librados2