feat(dashboards): add support for thresholds in line, table and yAxisRight in line widgets

[pranav-new-relic]

This PR adds support for the following attributes to the resource newrelic_one_dashboard

• y_axis_right: This helps specify ranges of values and more of the "right" Y - Axis, currently available only to line widgets, and comprises nested attributes y_axis_right_zero, y_axis_right_min, y_axis_right_max, y_axis_right_series
• is_label_visible: This helps control the Label Always Visible toggle under the thresholds section in the settings of a widget, currently available only to line widgets.
• threshold: This helps specify thresholds with line and table widgets, on the basis of which the visual appearance of values in the ranges specified in these thresholds changes (e.g. warning, critical ranges). This is currently available to line and table widgets (is also available to billboard, but we support this feature for billboards already). This is a nested attribute containing attributes name/column_name, from, to, severity.

Addresses #2647 and similar other Work Requests received by the team in this regard.

Dependency: newrelic-client-go

Requires changes in https://github.com/newrelic/newrelic-client-go/pull/1144

Manual Testing (Adding this sample piece of code for my reference)

Rigorously tested a multitude of scenarios (by modifying a lot of attributes and their values) using the following configuration

resource "newrelic_one_dashboard" "exampledash" {
  name        = "THRESHOLD TEST DASHBOARD"
  permissions = "public_read_only"

  page {
    name = "New Relic Terraform Example"

    widget_table {
      title  = "Table Widget 1"
      row    = 1
      column = 5
      width  = 4
      height = 4

      nrql_query {
        query = "FROM Transaction SELECT *"
      }

      threshold {
        from        = 1000
        to          = 2000
        column_name = "Table Column 11"
        severity    = "severe"
      }

      threshold {
        from        = 2500
        to          = 3600
        column_name = "Table Column 12"
        severity    = "critical"
      }
    }

    widget_table {
      title  = "Table Widget 2"
      row    = 5
      column = 5
      width  = 4
      height = 3

      nrql_query {
        query = "FROM Transaction SELECT *"
      }

      threshold {
        from        = 5000
        to          = 10000
        column_name = "Table Column 21"
        #         severity    = "critical"
      }

      threshold {
        #         from        = 15000
        to          = 30000
        column_name = "Table Threshold 22"
        severity    = "unavailable"
      }
    }

    widget_line {
      title  = "Line Widget 1"
      row    = 1
      column = 9
      width  = 4
      height = 4

      nrql_query {
        query = "FROM Transaction SELECT average(duration) FACET appName"
      }

      nrql_query {
        query = "FROM Transaction SELECT rate(count(*), 1 minute)"
      }

      is_label_visible = true

      y_axis_right {
        y_axis_right_zero   = true
        y_axis_right_series = ["US", "IN"]
        y_axis_right_min    = 500
        y_axis_right_max    = 100
      }

      threshold {
        from     = 300
        to       = 1800
        name     = "Line Threshold 11"
        severity = "critical"
      }

      threshold {
        from     = 2600
        to       = 3900
        name     = "Line Threshold 12"
        severity = "unavailable"
      }
    }

    widget_line {
      title  = "Line Widget 2"
      row    = 5
      column = 9
      width  = 4
      height = 3

      nrql_query {
        query = "FROM Transaction SELECT average(duration) FACET appName"
      }

      nrql_query {
        query = "FROM Transaction SELECT rate(count(*), 1 minute)"
      }

      #       is_label_visible = true

      y_axis_right {
        y_axis_right_zero   = false
        y_axis_right_series = ["A", "B"]
        #         y_axis_right_min    = 500
        #         y_axis_right_max    = 100
      }

      threshold {
#         from     = 300
#         to       = 1800
        name     = "Line Threshold 21"
        severity = "critical"
      }

      threshold {
        from     = 2600
#         to       = 3900
        name     = "Line Threshold 22"
#         severity = "unavailable"
      }
    }

    widget_billboard {
      title  = "Billboard Widget 1"
      row    = 1
      column = 1
      width  = 4
      height = 4

      nrql_query {
        query = "FROM Transaction SELECT rate(count(*), 1 minute)"
      }

      critical = "10"
      warning  = "20"
    }

    widget_billboard {
      title  = "Billboard Widget 2"
      row    = 5
      column = 1
      width  = 4
      height = 3

      nrql_query {
        query = "FROM Transaction SELECT rate(count(*), 1 minute)"
      }

#       critical = "300"
      warning  = "500"
    }
  }
}

[pranav-new-relic]

intermittent failures of relevant tests (work with the same creds locally), trying again