Update release versions for 26.02

[AyodeAwe]

Update docs.rapids.ai for the 26.02 release.

Changes:

• Roll version tiers forward in releases.json (legacy/stable/nightly/next_nightly)
• Add 26.02 to previous_releases.json
• Update projects-to-versions.json
• Remove cudf-java stable (only legacy remains)

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[AyodeAwe]

I think the failing checks are expected as there are no cudf-java stable docs at this time of the release.

cc @jameslamb

[jameslamb]

I think the failing checks are expected as there are no cudf-java stable docs at this time of the release.

That would explain why pre-commit run --all-files produces a diff like this:

diff --git a/ci/customization/projects-to-versions.json b/ci/customization/projects-to-versions.json
index 46fec7e..3b61d1c 100644
--- a/ci/customization/projects-to-versions.json
+++ b/ci/customization/projects-to-versions.json
@@ -25,7 +25,8 @@
     "nightly": "26.04"
   },
   "cudf-java": {
-    "legacy": "25.12"
+    "legacy": "25.12",
+    "stable": "26.02"
   },
   "cucim": {
     "legacy": "25.12",

But we shouldn't merge this with failing CI or with a broken "stable" link in the cudf-java section at https://docs.rapids.ai/api/

If there aren't 26.02 docs yet for cudf-java, then we shouldn't generate the "stable" link for that project.

Did that here: 2dd7b19