[v8.0] fix (ElasticSearchDB): convert exception object to string representation and FTS3 lifetime changes

[chaen]

Otherwise a real error is hidden

2023-11-17 05:43:06 UTC Monitoring/Monitoring ERROR: Exception while executing handler action
Traceback (most recent call last):
  File "/opt/dirac/versions/v11.0.23-1699879020/Linux-x86_64/lib/python3.11/site-packages/DIRAC/Core/DISET/private/Service.py", line 555, in _execu
teAction
    response = handlerObj._rh_executeAction(proposalTuple)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/dirac/versions/v11.0.23-1699879020/Linux-x86_64/lib/python3.11/site-packages/DIRAC/Core/DISET/RequestHandler.py", line 144, in _rh_exe
cuteAction
    result = self.__trPool.send(self.__trid, retVal)  # this will delete the value from the S_OK(value)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/dirac/versions/v11.0.23-1699879020/Linux-x86_64/lib/python3.11/site-packages/DIRAC/Core/DISET/private/TransportPool.py", line 109, in 
send
    return transport.sendData(msg)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/dirac/versions/v11.0.23-1699879020/Linux-x86_64/lib/python3.11/site-packages/DIRAC/Core/DISET/private/Transports/BaseTransport.py", li
ne 164, in sendData
    sCodedData = MixedEncode.encode(uData)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/dirac/versions/v11.0.23-1699879020/Linux-x86_64/lib/python3.11/site-packages/DIRAC/Core/Utilities/MixedEncode.py", line 17, in encode
    return DEncode.encode(inData)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/dirac/versions/v11.0.23-1699879020/Linux-x86_64/lib/python3.11/site-packages/DIRAC/Core/Utilities/DEncode.py", line 515, in encode
    g_dEncodeFunctions[type(uObject)](uObject, eList)
  File "/opt/dirac/versions/v11.0.23-1699879020/Linux-x86_64/lib/python3.11/site-packages/DIRAC/Core/Utilities/DEncode.py", line 486, in encodeDict
    g_dEncodeFunctions[type(dValue[key])](dValue[key], eList)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
KeyError: <class 'opensearchpy.helpers.errors.BulkIndexError'>

BEGINRELEASENOTES

*Core
FIX: convert exception object to string representation in ElasticSearchDB

*DMS
CHANGE: default proxy lifetime for FTS is 36h and force the redelegation when 12h are left

ENDRELEASENOTES

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/6905646988

Successful:

• integration