fix: only delete knot if it's the last entry of the TypeTable

[ilbertt]

Description

Only delete knot if it's the last entry of the TypeTable. This avoids removing shared knot types when multiple Rec()s are present in the same struct.

Fixes:

• Illegal op_code error with recursive blobs demergent-labs/azle#1513
• type index out of range error with recursive blobs  demergent-labs/azle#1518
• Problem with Rec Tuples demergent-labs/azle#1525
• Problems with Rec Opt Nat8 demergent-labs/azle#1526

How Has This Been Tested?

Same tests should still pass.

Checklist:

• My changes follow the guidelines in CONTRIBUTING.md.
• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.

[github-actions]

size-limit report 📦

Path	Size
@dfinity/agent	50.54 KB (+0.35% 🔺)
@dfinity/assets	55.45 KB (+0.12% 🔺)
@dfinity/auth-client	21.15 KB (0%)
@dfinity/candid	13.32 KB (+0.77% 🔺)
@icp-sdk/core	91 B (0%)
@dfinity/identity	20.59 KB (0%)
@dfinity/identity-secp256k1	33.88 KB (0%)
@dfinity/principal	4.44 KB (0%)

[lastmjs]

FYI it looks like this PR did not fully resolve demergent-labs/azle#1526