[Icons] improve DX when symfony/http-client
is not installed
#2678
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ux:icons:warm-cache
(addresses [Icons] report issues in ux:icons:warm-cache #2668)Exception when rendering a template w/o http-client:

Exception when running ux:icon:* command w/o http-client:

Output of

ux:icons:warm -v
when there are "potential" invalid icons:TODO