AIP-541: Add Model ID and End of Life columns to GenAI Resource Packs supported models table

[piyaviraj-ranasinghe]

What

Adds two columns to the Supported Models table in Mendix Cloud GenAI Resource Packs
(content/en/docs/genai/mendix-cloud-genai/mendix-cloud-grp.md):

• Model ID — the identifier the Mendix Cloud GenAI Connector uses to address a specific
  model, populated for all 11 rows.
• End of Life — region-scoped end-of-life date, populated only where one is announced.

Also adds a short legend below the table explaining both columns.

Details

Model IDs are taken verbatim from the GenAI backend's supported-models response, per region:

• EU (Frankfurt) models use the eu. cross-region inference profile prefix
  (for example, eu.anthropic.claude-sonnet-4-6), matching their YES in the CRI column.
• Claude Sonnet 3 and the Cohere Embed v3 pair use unprefixed IDs, matching their NO in
  the CRI column.
• The combined Cohere Embed v3 row carries both IDs (cohere.embed-english-v3 and
  cohere.embed-multilingual-v3) on separate lines.

Empty End of Life cells use an em dash, consistent with the GenAI Units exchange-rate table
further down the same page.

Two related findings, both deliberately left out of this PR:

1. Claude Sonnet 4 (eu.anthropic.claude-sonnet-4-20250514-v1:0) is the one model with a
   confirmed Bedrock EOL date — October 14, 2026, covering the EU inference regions and
   not ca-central-1. It is returned by the eu-central API but has never been documented in
   this table or in the GenAI Units exchange-rate table, so it received no row. If it is
   provisionable by users, it needs a row and that date.
2. Claude Sonnet 3 (anthropic.claude-3-sonnet-20240229-v1:0, Mendix Cloud Canada) has no
   published Bedrock EOL date. It is absent from Bedrock's Legacy/pending-EOL table, which
   omits models already past EOL, yet the ca-canada API still serves it — consistent with AWS's
   provision for continued access under a private arrangement with the provider. Shown as a
   dash rather than an invented date.

Claude Sonnet 4.5 is the next one to watch: Anthropic's tentative retirement is September 29, 2026, but Bedrock has not declared it Legacy, so it is left blank.

[piyaviraj-ranasinghe]

@Karuna-Mendix Could u please review this PR