Backport of consul-template: Add fault tolerant defaults into release/1.3.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #13041 to be assessed for backporting due to the inclusion of the label backport/1.3.x.

The below text is copied from the body of the original PR.

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closes #13020

This PR adds fault-tolerant defaults to the default agent config.

• BlockQueryWaitTime: defaults to 5 min, matching the default value Consul uses
• MaxStale: defaults to 10 years matching the default value Consul uses
• Wait.Min: defaults to 5 seconds overriding the default of 0 that Consul Template uses
• Wait.Max: defaults to 4 minutes matching the default Consul Template uses
• ConsulRetry.Attempts: defaults to 0 which is the unlimited value - overrides the Consul Template default of 12
• ConsulRetry.Backoff: defaults to 250ms matching the default that Consul Template uses
• ConsulRetry.MaxBackoff: defaults to 1 minute matching default that Consul Template uses
• VaultRetry.Attempts: defaults to 0 which is the unlimited value - overrides the Consul Template default of 12
• VaultRetry.Backoff: defaults to 250ms matching the default that Consul Template uses
• VaultRetry.MaxBackoff: defaults to 1 minute matching default that Consul Template uses

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