Add support to enable multiline in the cloud logs agent

[ocofaigh]

There is a helm value called enableMultiline that we should expose in the module and the DA to allow consumers to opt in / out of it

snippet from confgmap.yaml

    {{- if .Values.enableMultiline }}
    @INCLUDE filter-multiline.conf
    {{- end }}

[grant-g]

Hi, it would be very helpful for us to have this in place soon as we're moving from Classic environments (where I was in a position to enable multiline) to Dreadnought environments where this value needs to be exposed in order to be used. Thank-you in advance!

[ocofaigh]

@grant-g This support was added in v1.1.0