tidb-cloud: refresh HATP quickstart and add connection steps to the TiDB Cloud quickstart

[qiancai]

What is changed, added or deleted? (Required)

1. tidb-cloud/tidb-cloud-htap-quickstart.md: Refreshed the HTAP quickstart guide:

   • Updated sample dataset from "Steam Game Stats" to "Steam Games Dataset 2021-2025"
   • Added detailed import instructions for the new dataset
   • Changed database references from game to steam
   • Changed metrics from average_playtime_forever to recommendations
   • Enhanced SQL queries with additional analytical columns (genres, developer)
   • Added WHERE, HAVING, and LIMIT clauses to queries
   • Updated all EXPLAIN ANALYZE outputs with new execution statistics
   • Refined descriptions and instructions

2. tidb-cloud/tidb-cloud-quickstart.md: Added a new "Step 4: Connect to your instance" section with MySQL CLI connection instructions.

Which TiDB version(s) do your changes apply to? (Required)

• v8.5 (TiDB 8.5 versions)

What is the related PR or file link(s)?

• Other reference link(s): N/A

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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[gemini-code-assist]

Code Review

This pull request updates the TiDB Cloud HTAP Quick Start guide to use the Kaggle 'Steam Games Dataset 2021-2025' instead of the previous sample dataset, adding detailed download and import instructions alongside updated SQL queries and execution plans. It also adds a new section to the Quick Start guide on connecting to a starter instance using the MySQL CLI. The review feedback focuses on aligning the new documentation with the style guide by suggesting the use of active voice, present tense, and more concise phrasing, as well as correcting minor grammatical errors.

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[qiancai]

Reason: This step is to avoid the following import errors.

CastValueError: when encoding 12712-th data row in file a_steam_data_2021_2025.csv: Value conversion failed for column 'developer'. Expected type: varchar(512) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin, received value: ?. Reason: [types:1406]Data Too Long, field len 512, data len 584. Please correct the source data and retry.

CastValueError: when encoding 55532-th data row in file a_steam_data_2021_2025.csv: Value conversion failed for column 'categories'. Expected type: varchar(512) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin, received value: ?. Reason: [types:1406]Data Too Long, field len 512, data len 522. Please correct the source data and retry.