feat(nimbus) Add advanced targeting for 151 trainhop, content markets and 1 row shortcut experiments (#15063)

This commit adds new targeting for:
- 151 trainhop
- 1 row shortcuts
- markets with and without editorial content

Fixes #15006

---------

Co-authored-by: Yashika Khurana <yashikakhuranayashika@gmail.com>
Co-authored-by: Yashika Khurana <yashikakhurana@Yashikas-MBP.home.local>

Author: 3 people

experimenter/experimenter/targeting/constants.py

@@ -4117,6 +4117,20 @@ def __post_init__(self):
     application_choice_names=(Application.DESKTOP.name,),
 )
 
+FX_151_TRAINHOP = NimbusTargetingConfig(
+    name="New Tab Fx151 Mar-27 Trainhop",
+    slug="newtab-151-0327-trainhop",
+    description=(
+        "Desktop users having the New Tab 151.1.20260327.141953 train hop, "
+        "which includes users of Fx149"
+    ),
+    targeting="newtabAddonVersion|versionCompare('151.1.20260327.141953') >= 0",
+    desktop_telemetry="",
+    sticky_required=False,
+    is_first_run_required=False,
+    application_choice_names=(Application.DESKTOP.name,),
+)
+
 BUILDID_20251006095753 = NimbusTargetingConfig(
     name="Build ID 20251006095753 or higher",
     slug="buildid-20251006095753",
@@ -4256,6 +4270,53 @@ def __post_init__(self):
 )
 
 
+EDITORIAL_CONTENT_MARKETS = (
+    "['AT', 'BE', 'CA', 'CH', 'DE', 'ES', 'FR', 'GB', 'IE', 'IN', 'IT', 'US']"
+)
+
+EDITORIAL_CONTENT_AVAILABLE_MARKETS = NimbusTargetingConfig(
+    name="New Tab Editorial Content Available Markets",
+    slug="newtab-editorial-content-markets",
+    description=("Users in markets where Firefox New Tab Editorial Content is available"),
+    targeting=f"region in {EDITORIAL_CONTENT_MARKETS}",
+    desktop_telemetry="",
+    sticky_required=False,
+    is_first_run_required=False,
+    application_choice_names=(Application.DESKTOP.name,),
+)
+
+EDITORIAL_CONTENT_UNAVAILABLE_MARKETS = NimbusTargetingConfig(
+    name="New Tab Editorial Content Unavailable Markets",
+    slug="newtab-non-editorial-content-markets",
+    description=(
+        "Users in markets where Firefox New Tab Editorial Content is NOT available"
+    ),
+    targeting=f"(region in {EDITORIAL_CONTENT_MARKETS}) != true",
+    desktop_telemetry="",
+    sticky_required=False,
+    is_first_run_required=False,
+    application_choice_names=(Application.DESKTOP.name,),
+)
+
+TOPSITES_1ROW_NON_EDITORIAL_FX151_TRAINHOP = NimbusTargetingConfig(
+    name="Non-Editorial Markets, 1-Row Top Sites, Fx151 Trainhop",
+    slug="topsites-1row-non-editorial-fx151-trainhop",
+    description=(
+        "Desktop users in non-editorial content markets, with top sites rows set to 1, "
+        "having the New Tab 151.1.20260327.141953 train hop"
+    ),
+    targeting=(
+        f"(region in {EDITORIAL_CONTENT_MARKETS}) != true"
+        f" && {FX_151_TRAINHOP.targeting}"
+        " && 'browser.newtabpage.activity-stream.topSitesRows'|preferenceValue == 1"
+    ),
+    desktop_telemetry="",
+    sticky_required=True,
+    is_first_run_required=False,
+    application_choice_names=(Application.DESKTOP.name,),
+)
+
+
 class TargetingConstants:
     TARGETING_CONFIGS = {
         targeting.slug: targeting for targeting in NimbusTargetingConfig.targeting_configs