feat: `ARGO_TEMPLATE` env var without `inputs.parameters`

[tooptoop4]

Fixes https://github.com/argoproj/argo-workflows/issues/8790

Motivation

reduce etcd growth

Modifications

has env variable to maintain existing functionality for some users

[juliev0]

Did you test it with both environment variable set "false" and unset?

[juliev0]

As a follow up to your various changes, would you be able to add to the docs the various ways that somebody can reduce their overall Pod size, including through offloading to a configmap?

[tooptoop4]

Did you test it with both environment variable set "false" and unset?

yes

As a follow up to your various changes, would you be able to add to the docs the various ways that somebody can reduce their overall Pod size, including through offloading to a configmap?

i can raise a follow up docs pr