chore(nifi): Update major/minor versions for 26.7.0 #1498

Part of #1479.

• Add: 2.9.0
• Deprecate: 2.7.2
• Remove: 1.28.1

Update tasks

• Release a new version of nifi-iceberg-bundle for any new NiFi versions added (also add version with Patchable).
• Release a new version of nifi-opa-authorizer-plugin for any new NiFi versions added (also add version with Patchable).
• Update boil-config.toml to reflect the agreed upon versions in the spreadsheet (including the removal of old versions).
• Update boil-config.toml to the latest supported version of JVM (base and devel).
• Update other dependencies if applicable (eg: jmx_exporter, kcat, scala, etc).
• Check other operators (getting_started / kuttl / supported-versions) for usage of the versions. Add the PR(s) to the list below.
• Update the version in demos. Add the PR(s) to the list below.

Related Pull Requests

• chore(nifi): Add version 2.9.0 #1463
• chore!(nifi): Remove 1.28.1, deprecate 2.7.2 #1520
• chore(nifi): Bump gitsync to 4.6.0 for all images #1546
• chore: Update versions for SDP 26.7.0 nifi-operator#944
• Link to any other operator PRs (getting_started / kuttl)
• chore: Bump NiFi to 2.9.0 demos#413
• Release notes

Acceptance

• Can build image (either locally, or in CI)
• All kuttl tests pass (either locally, or in CI)
• Release notes added to documentation and linked as a PR above
• Release notes written in a comment below
• Applicable release-note label added to this issue

# Where x.y.z is the new version added in this PR
boil build nifi=x.y.z --strip-architecture --load

kind load docker-image oci.stackable.tech/sdp/nifi:x.y.z-stackable0.0.0-dev

# Change directory into the nifi-operator repository and update the
# product version in tests/test-definition.yaml
./scripts/run-tests --test-suite smoke-latest # or similar

Please consider updating this template if these instructions are wrong, or
could be made clearer.