fix: remove transceiver instructions parameter

[0xIryna]

Proposed Changes:

• remove transceiverInstructions parameter from sendMTokenIndex, sendRegistrarKey and sendRegistrarListStatus in HubPortal
• use the default transceiver instructions instead (new bytes(1)), so callers are unable to override the default relaying mechanism.

[github-actions]

LCOV of commit 5772b6b during Forge Coverage #96

Summary coverage rate:
  lines......: 96.6% (198 of 205 lines)
  functions..: 90.5% (67 of 74 functions)
  branches...: 79.2% (38 of 48 branches)

Files changed coverage rate:
                                 |Lines       |Functions  |Branches    
  Filename                       |Rate     Num|Rate    Num|Rate     Num
  =====================================================================
  src/HubPortal.sol              | 100%     43| 100%    11|85.7%      7

[github-actions]

Changes to gas cost

Generated at commit: 516c04c40c48fb51ad03390309cf2283d2d88f46, compared to commit: 870efba6e1ba95eefc4b7b3ffa5e76b44780b962

🧾 Summary (20% most significant diffs)

Contract	Method	Avg (+/-)	%

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Full diff report 👇

Contract	Deployment Cost (+/-)	Method	Min (+/-)	%	Avg (+/-)	%	Median (+/-)	%	Max (+/-)	%	# Calls (+/-)
HubPortal	5,535,383 (-9,032)	currentIndex getMigratesImmutables getMode mode rateLimitDuration registrar sendMTokenIndex sendRegistrarKey sendRegistrarListStatus setThreshold setTransceiver tokenDecimals transferOwnership upgrade	2,078 (-22) 2,504 (-44) 361 (+45) 331 (-22) 327 (-22) 327 (-22) 71,706 (-406) 69,028 (-343) 69,881 (-320) 9,014 (+66) 188,494 (-22) 3,815 (-22) 29,448 (-22) 62,093 (-132)	-1.05% -1.73% +14.24% -6.23% -6.30% -6.30% -0.56% -0.49% -0.46% +0.74% -0.01% -0.57% -0.07% -0.21%	3,619 (-22) 2,504 (-44) 361 (+45) 331 (-22) 327 (-22) 327 (-22) 71,706 (-406) 69,028 (-343) 69,881 (-320) 9,014 (+66) 188,494 (-22) 3,815 (-22) 29,448 (-22) 63,343 (-132)	-0.60% -1.73% +14.24% -6.23% -6.30% -6.30% -0.56% -0.49% -0.46% +0.74% -0.01% -0.57% -0.07% -0.21%	2,183 (-22) 2,504 (-44) 361 (+45) 331 (-22) 327 (-22) 327 (-22) 71,706 (-406) 69,028 (-343) 69,881 (-320) 9,014 (+66) 188,494 (-22) 3,815 (-22) 29,448 (-22) 63,343 (-132)	-1.00% -1.73% +14.24% -6.23% -6.30% -6.30% -0.56% -0.49% -0.46% +0.74% -0.01% -0.57% -0.07% -0.21%	8,034 (-22) 2,504 (-44) 361 (+45) 331 (-22) 327 (-22) 327 (-22) 71,706 (-406) 69,028 (-343) 69,881 (-320) 9,014 (+66) 188,494 (-22) 3,815 (-22) 29,448 (-22) 64,593 (-132)	-0.27% -1.73% +14.24% -6.23% -6.30% -6.30% -0.56% -0.49% -0.46% +0.74% -0.01% -0.57% -0.07% -0.20%	4 (0) 2 (0) 5 (0) 3 (0) 2 (0) 3 (0) 1 (0) 1 (0) 1 (0) 5 (0) 25 (0) 5 (0) 2 (0) 2 (0)