Add test for casting storage ref to an invalid type

[SupunS]

Description

There were no tests for the following scenario:

• Saving struct value of type T in an account
• Borrowing it as a super-type auth AnyStruct
• Downcast it to a different type auth R

This was the only scenario that doesn't work if we do #1217 (there's a solution for it, I'll update the original git-issue with more context/info), but realized there were no test cases for this particular case (all tests were passing!)

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[github-actions]

Cadence Benchstat comparison

This branch with compared with the base branch onflow:master commit ad6895c
The command go test ./... -run=XXX -bench=. -shuffle=on -count N was used.
Bench tests were run a total of 7 times on each branch.

Results

	old.txt	new.txt
	time/op		delta
RuntimeStorageWriteCached-2	136µs ± 4%	173µs ±29%	+27.13%	(p=0.011 n=7+7)
CheckContractInterfaceFungibleTokenConformance-2	147µs ± 3%	157µs ± 6%	+7.14%	(p=0.001 n=6+7)
InterpretRecursionFib-2	2.62ms ± 4%	2.79ms ± 5%	+6.47%	(p=0.002 n=7+7)
ContractInterfaceFungibleToken-2	44.9µs ± 1%	47.8µs ± 1%	+6.34%	(p=0.001 n=6+7)
RuntimeFungibleTokenTransfer-2	1.13ms ± 4%	1.18ms ± 5%	+4.58%	(p=0.022 n=6+7)
ParseInfix-2	24.0µs ± 2%	24.9µs ± 2%	+3.91%	(p=0.001 n=7+7)
QualifiedIdentifierCreation/Three_levels-2	159ns ± 1%	164ns ± 2%	+3.19%	(p=0.002 n=7+7)
QualifiedIdentifierCreation/One_level-2	2.69ns ± 3%	2.78ns ± 1%	+3.04%	(p=0.005 n=7+7)
ParseArray-2	23.0ms ± 2%	23.6ms ± 4%	+3.01%	(p=0.026 n=7+7)
ParseDeploy/decode_hex-2	1.37ms ± 1%	1.41ms ± 1%	+3.00%	(p=0.001 n=7+7)
ParseFungibleToken-2	459µs ± 1%	469µs ± 5%	+2.35%	(p=0.035 n=6+7)
RuntimeResourceDictionaryValues-2	16.7ms ± 2%	16.7ms ± 4%	~	(p=1.000 n=7+7)
ParseDeploy/byte_array-2	33.9ms ± 2%	34.4ms ± 4%	~	(p=0.383 n=7+7)
NewInterpreter/new_interpreter-2	1.13µs ± 4%	1.16µs ± 3%	~	(p=0.053 n=7+7)
NewInterpreter/new_sub-interpreter-2	2.09µs ± 4%	2.13µs ± 4%	~	(p=0.128 n=7+7)
	alloc/op		delta
RuntimeFungibleTokenTransfer-2	233kB ± 0%	233kB ± 0%	~	(p=0.831 n=7+7)
RuntimeResourceDictionaryValues-2	4.34MB ± 0%	4.34MB ± 0%	~	(p=0.620 n=7+7)
RuntimeStorageWriteCached-2	83.7kB ± 0%	83.7kB ± 0%	~	(p=0.434 n=7+6)
QualifiedIdentifierCreation/One_level-2	0.00B	0.00B	~	(all equal)
QualifiedIdentifierCreation/Three_levels-2	64.0B ± 0%	64.0B ± 0%	~	(all equal)
CheckContractInterfaceFungibleTokenConformance-2	66.4kB ± 0%	66.4kB ± 0%	~	(all equal)
ContractInterfaceFungibleToken-2	26.7kB ± 0%	26.7kB ± 0%	~	(all equal)
InterpretRecursionFib-2	1.21MB ± 0%	1.21MB ± 0%	~	(all equal)
NewInterpreter/new_interpreter-2	680B ± 0%	680B ± 0%	~	(all equal)
NewInterpreter/new_sub-interpreter-2	1.06kB ± 0%	1.06kB ± 0%	~	(all equal)
	allocs/op		delta
RuntimeFungibleTokenTransfer-2	4.43k ± 0%	4.43k ± 0%	~	(p=1.000 n=7+7)
RuntimeResourceDictionaryValues-2	108k ± 0%	108k ± 0%	~	(p=0.730 n=6+7)
RuntimeStorageWriteCached-2	1.42k ± 0%	1.42k ± 0%	~	(all equal)
QualifiedIdentifierCreation/One_level-2	0.00	0.00	~	(all equal)
QualifiedIdentifierCreation/Three_levels-2	2.00 ± 0%	2.00 ± 0%	~	(all equal)
CheckContractInterfaceFungibleTokenConformance-2	1.07k ± 0%	1.07k ± 0%	~	(all equal)
ContractInterfaceFungibleToken-2	458 ± 0%	458 ± 0%	~	(all equal)
InterpretRecursionFib-2	25.0k ± 0%	25.0k ± 0%	~	(all equal)
NewInterpreter/new_interpreter-2	11.0 ± 0%	11.0 ± 0%	~	(all equal)
NewInterpreter/new_sub-interpreter-2	31.0 ± 0%	31.0 ± 0%	~	(all equal)

[codecov-commenter]

Codecov Report

Merging #1243 (5b56d32) into master (ad6895c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1243   +/-   ##
=======================================
  Coverage   77.59%   77.59%           
=======================================
  Files         274      274           
  Lines       35232    35232           
=======================================
  Hits        27339    27339           
  Misses       6806     6806           
  Partials     1087     1087           

Flag	Coverage Δ
unittests	77.59% <ø> (ø)

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[turbolent]

Thank you for adding a test for this 👍